A container adapter (10) includes lower sidewalls (42, 43, 44, 45) and upper sidewalls (56, 57, 58, 59) separated by a rim (40). The lower side walls (42, 43, 44, 45) may be received within a pitcher (12), and the rim (40) is positioned on the upper open end (16) of the pitcher (12). The upper sidewalls (56, 57, 58, 59) increase the height of the pitcher (12) so that it can interface with a splash shield (33) of an ice chute (32) of a drink blending machine (20). Side clamps (50) assist in maintaining the adapter (10) on the pitcher (12), and a pouring spout (62) is provided at the junction of two of the upper sidewalls (58, 59).