Abstract: The invention provides a drink mixing cup for fluids comprising an outer chamber having an outer rim disposed at its top and a chamber disposed inside the outer chamber having an inner rim disposed below the outer rim by an amount selected to optimize mixing fluids poured from said chambers when drunk by humans while not interfering with their noses. The design allows for nesting of cups to reduce storage space. Anti-nesting ribs prevent fill nesting so that separation of cups is not difficult. When thin wall made from plastic are used and the inner chamber is elevated, the fluid in the inner chamber is thermally insulated. When inverted, the cups can serve as a single shot drinking glass.