Device for use in beverage containers

Systems and methods for isolating a bottom open end of a drinking straw from objects, such as fruit, leaves, seeds, etc., located within a beverage container. A sieve is disclosed that has outer dimensions that substantially match inner dimensions of a bottom portion of a drinking glass. The sieve includes a top platform having a drinking straw opening and a plurality of filter openings sized to permit liquid to pass therethrough while preventing passage by objects. The bottom open end of the drinking straw is positionable within a cavity of the sieve that is isolated from the objects, such that a user may consume the beverage through the drinking straw without the objects obstructing the drinking straw.