Abstract: A novel drink cap (10) for preventing foreign substances from entering an opening (12) of a beverage container (18), the drink cap (10) comprising at least one flexible non-wetting sheet (22) that has an outer surface (24), an inner surface (26), an edge portion (28) located at the outermost periphery of the flexible sheet (22), a skirt portion (34) located adjacent to the edge portion (28), an elastic periphery region located adjacent to the skirt portion (34), and a central web portion (30), whereby the central web portion (30) of the inner surface (26) of the at least one flexible sheet (22) covers the opening (12) of the beverage container (18). The present invention is also directed to a method for covering an opening (12) of a beverage container (18) using the novel drink cap (10).