An apparatus has a base having a side that defines an interior space, and a periphery that defines an aperture above the interior space. A bowl element has a rim and is shaped to fit into the interior space such that the rim abuts the periphery. A lever mechanism has a lever, a fulcrum having an aperture, a pair of ears on opposite sides of the aperture, pins extending from each of the pair of ears into the lever for pivotally mounting the lever on the fulcrum, and an attachment element for attaching the fulcrum to the base. The lever has a proximal end adapted to abut the bowl element, and a distal end opposite the proximal end.