the description , which follows , and the embodiments described therein , is provided by way of illustration of an example , or examples of particular embodiments of principles and aspects of the present invention . these examples are provided for the purposes of explanation , and not of limitation , of those principles and of the invention . referring to fig1 , 2 , and 3 a container 10 , shown in a first or upright position , includes a body 20 of generally hollow form about a vertical axis with an open top end 30 and open bottom end 40 and a base cap 50 constructed to define a cavity 60 for holding liquid and to sealingly engage with body 20 . as shown , the cap 50 includes a generally flat base 70 . optionally , a seal 55 may also be used . the body 20 includes an outer side wall 80 and an inner side wall 90 . the inner side wall 90 is shown having a generally frusto - conical shape but may equally be generally cylindrically or substantially cone shaped . the inner side wall 90 is positioned within the outer side wall and is sloped in opposite direction with respect to the vertical , such that inner wall 90 adjoins the outer side wall 80 at the outer top edge region 100 of the body 20 and at the opposing end forms a short , generally cylindrically shaped cup portion or dosing chamber 120 having a closed bottom end wall 110 . the cup 120 extends axially beyond the outer side wall 80 . the cup 120 has a first aperture 130 in bottom cup end wall 110 in air communication with cavity 60 and a second aperture 140 on the side wall of cup 120 in the area adjacent cup base portion 150 . apertures 140 and 130 are shown as circular but may be slits . in any configuration , the apertures are dimensioned generally according to the surface tensions of the liquids for which the container may be directed . the outer side wall 80 and inner side wall 90 thereby define an inner hollow space or chamber 160 and an outer hollow space or chamber 170 . the inner chamber 160 has an open end 30 at the top of body 20 and a bottom end wall 110 . the outer chamber 170 has an open end 40 at the bottom end of body 20 and is closed at the outer top edge region 100 of the body 20 . the outer chamber 170 is in air communication with aperture 140 . the outer side wall 80 in the area directly adjacent open end 40 includes a series of external screw threads 180 . screw threads 180 are connectable with the series of internal screw threads 190 formed on the base cap . engagement of cap 50 to body 20 may be by threaded arrangement as shown , by friction fit ( not shown ), or other known manner of sealing engagement . the volume of a single liquid dose is pre - determined by the volume of cup 120 and the relative position of second aperture 140 on the side wall of cup 120 . the liquid dose volume will be less if aperture 140 is positioned closer to bottom end wall 110 . for dysphagia applications , the dose volume is typically 5 ml . to 20 ml . for travel container application , the dose volume is typically 20 ml . to 50 ml . in operation , cap 50 is disengaged from body 20 and body 20 is rotated 180 degrees from the first position to a second or inverted position so that open end 40 of outer chamber 170 becomes an interim top opening of body 20 . liquid or fluid is poured into outer chamber 170 to any desired level up to the edge of open end 40 and cap 50 is reattached to body 20 . container 10 is then rotated 180 degrees to return to the first position . as container 10 rotates , liquid fills cavity 60 and air from inner chamber 160 enters into outer chamber 170 through aperture 140 . the entering air causes liquid in outer chamber 170 to flow through aperture 130 into cup 120 until the level of liquid in cup 120 prevents air entering aperture 140 . once air stops entering aperture 140 , no further air enters the outer chamber 170 and no further liquid flows into cup 120 . the amount of liquid in cup 120 represents a pre - determined , controlled dose of liquid that the user may drink through open first end 30 by tilting container 10 . additional controlled doses of liquid equal to the first dose are obtainable by withdrawing liquid from inner chamber 160 by tilting the container and drinking from open end 30 or without tilting via use of a straw , followed by rotation of container 10 to the first position . such process results in another equal dose of liquid for further consumption by the user . these process steps and controlled dosing are repeatable until no liquid remains in outer chamber 170 . fig4 , 5 , and 6 show an alternative embodiment wherein the liquid volume dose may be adjusted by the user . the container shown in the inverted position includes a body 20 of generally hollow form about a vertical axis with an open end 30 ( not visible ) at the top of container 10 and open end 40 at the bottom of the container . a base cap 50 is adapted to sealingly engage body 20 . as shown , the cap 50 includes a generally flat base 70 . the liquid cavity 60 of base cap 50 is not visible in this figure . the outer side wall 80 in the area directly adjacent open end 40 includes a series of external screw threads 180 . screw threads 180 are connectable with the series of internal screw threads 190 formed on the base cap . in this embodiment , the body 20 of the container has an inner chamber 160 ( not visible ) and an outer chamber 170 defined in the same manner as the embodiment shown in fig1 , 2 and 3 . the inner side wall 90 ( not visible ) includes a short , generally cylindrically shaped cup portion or dosing chamber 120 having a closed bottom end wall 110 that extends axially beyond the outer side wall 80 . cup 120 has an aperture 130 in bottom end wall 110 and an angled slitted aperture 200 on the side wall of cup 120 . a second cylindrically shaped cup 210 dimensioned to rotatably engage over cup 120 includes a first circular aperture 220 on the second cup end wall 230 and a second angled , slitted aperture 240 on the side wall of second cup 210 . the angle of slitted aperture 240 is approximately perpendicular relative to the angle of slitted aperture 200 . with cap 50 detached and second cup 210 in fitted arrangement over cup 120 , circular aperture 220 of second cup 210 aligns with circular aperture 130 of cup 120 such that inner chamber 160 is in liquid communication with cavity 60 . as second cup 210 is rotated about its axis , slitted aperture 240 intersects with slitted aperture 200 to define an intersecting aperture 250 having a distance “ h ” from the second cup bottom end wall 230 . inner chamber 160 is thereby in fluid communication with outer chamber 170 via intersecting aperture 250 . continued rotation of second cup 210 about its axis results in the re - position of intersecting aperture 250 relative to the end wall of second cup 210 and cup base portion 150 , namely increasing or decreasing distance “ h ”. a lower “ h ” value corresponds to a smaller volume of dosed liquid and a higher “ h ” value corresponds to a larger volume of dosed liquid . the side wall of second cup 210 may optionally have volume amounts along the outer edge of slitted aperture 240 . fig7 , 8 , 9 , and 10 show a further alternative embodiment wherein the liquid deposit chamber 160 is internal of the liquid withdrawal chamber 170 . the body 20 has a skewed frusto - conical shape and includes an outer side wall 80 and an inner side wall 90 of vacuum walled construction comprised of walls 90 a and 90 b with a vacuum space 95 therebetween . this vacuum wall construction thermally insulates liquid in the liquid deposit chamber . outer side wall 80 is substantially vertical on one side and slopes outwardly with respect to the vertical on the opposing side . the inner wall 90 adjoins the outer side wall 80 at the bottom edge region 105 of the body 20 and at the opposing end forms a generally cylindrically liquid deposit chamber 160 having a closed top end 115 comprised of walls 115 a and 115 b . the deposit chamber 160 has an aperture 140 on the side wall of chamber 160 in the area adjacent open end 45 . aperture 140 may be a slit as shown or may be circular . in any configuration , the aperture is dimensioned generally according to the surface tensions of the liquids for which the container may be directed . the outer side wall 80 and inner side wall 90 thereby define an inner hollow space or chamber 160 and an outer hollow space or chamber 170 . the outer chamber 170 has an open end 30 at the top of body 20 and a closed opposing end at bottom edge region 105 . the inner chamber 160 has an open end 45 at the bottom end of body 20 and is closed at top wall 115 . the outer chamber 170 is in liquid communication with aperture 140 . the outer side wall 80 in the area directly adjacent bottom edge region 105 includes a series of external screw threads 180 . screw threads 180 are connectable with the series of internal screw threads 190 formed on the base cap . engagement of cap 50 to body 20 may be by threaded arrangement as shown , by friction fit ( not shown ), or other known manner of sealing engagement . in operation , cap 50 is disengaged from body 20 and body 20 is rotated 180 degrees from the first position to a second or inverted position so that open end 45 of inner chamber 160 becomes an interim top opening of body 20 . liquid or fluid is poured into inner chamber 160 to any desired level up to the bottom of aperture 140 and cap 50 is reattached to body 20 . container 10 is then rotated 180 degrees to return to the first position . as container 10 rotates , air from outer chamber 170 enters into inner chamber 160 through aperture 140 . the entering air causes liquid in inner chamber 160 to flow through aperture 140 into outer chamber 170 until the level of liquid prevents air entering aperture 140 . once air stops entering aperture 140 , no further air enters the inner chamber 160 and no further liquid flows into outer chamber 170 . the amount of liquid in outer chamber 170 represents a pre - determined , controlled dose of liquid that the user may drink through open first end 30 . additional controlled doses of liquid equal to the first dose are obtainable by withdrawing liquid from outer chamber 170 by tilting the container and drinking from open end 30 or without tilting via use of a straw . a typical construction of the container and its elements of the present invention would normally be a rigid plastic material but other materials may be equally suitable for different applications . the container may be constructed of ceramic , porcelain , glass , metal , clay , paper , or combinations thereof . the container may optionally be constructed of thermal insulating materials or have vacuum walls to maintain the contained liquid at a desired temperature ( either hot or cold ). the container may also optionally have one or more external handles mounted or pre - formed on the external body wall . it will be understood that various changes , modifications and adaptations may be made by those having ordinary skill in the art without departing from the spirit of the invention or the scope thereof as set out by the claims that follow .