a bottle for dispensing fluids into a capless filler system , the bottle configured with an elongated smooth neck designed for insertion into a capless filler opening to actuate and displace one or more flapper seals when emptying the fluid into the capless filler . the bottle is sealed with a cap with a first set of screw threads that engages the neck at a top portion with a second set of screw threads on an interior surface of the top portion of the neck . the cap can be a child proof cap . the bottle can be made of plastic that is clear or opaque .