Non-spill bottle cap used with water dispensers

A closure for a container of the type having a neck formed with a lip and a surrounding bead comprising

• a unitary cap having a seamless cap top shaped to fit over said neck formed with a well having a seamless cylindrical interior side wall and an open bottom a cap skirt depending from said top shaped to fit around said lip and bead and having cap retention means cooperable with said neck to hold said cap on said neck in liquid-tight manner,
• a plug for said well having a plug top and a cylindrical member surrounding and attached to said plug top, said cylindrical member comprising a plug skirt, a flange projecting outward from said cylindrical member larger than the inside of said well to limit inward movement of said plug relative to said well, the outside wall of said plug skirt being smaller in diameter than said flange and said cylindrical member being formed with a circumferential groove immediately below said flange, said plug skirt having a portion having an outside diameter dimensioned to form with said interior side wall of said well a liquid-tight fit, said plug top being formed with a closed end smaller than said plug skirt and downward-outward directed flanks merging with said plug skirt below the level of said groove, there being a space between said flanks and said cylindrical member opposite said circumferential groove to permit said cylindrical member to collapse inwardly at said circumferential groove.
• said well being formed adjacent its lower edge with an in-turned inner bead adapted to snap into said groove to hold said plug in said well against unintentional dislodgment,
• said plug skirt being characterized by the fact that it has an outside surface with no vertical seam thereon, said well being characterized by the fact that said well has no vertical, said cylindrical member vicinal said groove being flexible, whereby said cylindrical member may be collapsed inwardly.