Abstract: An anti-spill drinking straw and cap assembly for use with a beverage container is disclosed. The assembly includes a drinking straw and receptacle cover having a substantially sealed interface, either by interference fit or thermal or chemically fused attachment to provide an anti-spill sealed interface. According to either embodiment, the straw-and-cap assembly is readily adapted to be used with any container having either a full-rim opening, or an opening such as that defined by a scored region or other predetermined opening provided within the top surface of the cap removed by a pull-tab or push-through structure either central to or eccentric with a central portion of the top surface. The drinking straw and cap may be provided as an assembly for use with any receptacle configured to receive it, with standard or custom sized openings.