a bottle for liquids is fitted with a dropper adaptor including a plastic body having extending longitudinally therethrough a flow channel . over at least a first length portion thereof the flow channel has a cross section in the shape of a star with at least three branches . the channel opens outwardly from the body only at an outlet aperture at an outlet end of the flow channel and at an inlet aperture , defined by plural windows , at an internal end of the flow channel .