A combination closure-cup assembly including a rotatably removable cup for securing to a bottle. The bottle having an inner cavity, frusto-conical neck and spout including external threading, and an annual peripheral flange extending outwardly from the frusto-conical neck below the external threading. The cup has a first end having a circular flat bottom including a scalloped rim, a second end, and a frusto-conical neck portion connecting the first and second end. The cup includes an outer surface, an internal cavity having threading, an inwardly recessed straw aperture, and a leak proof seal. The outer surface has a plurality of axial ribs.