The bowl is divided into lower and upper compartments. The side of the lower compartment is formed in part, by a lower portion of the side wall of the bowl and, in part, by a upwardly extending wall which extends upward from the bottom of the bowl and terminates at a platform of the upper compartment. Alternatively, the side of the lower compartment is formed entirely by an upwardly extending wall which extends upwardly from the bottom of the bowl and which is spaced apart from the side wall of the bowl. The upper portion of the side wall of the bowl forms the side of the upper compartment.
