Abstract: Apparatus for cooling and retarding temperature elevation of liquids in a vessel having a bottom, side walls and end walls forming an enclosure for receiving the liquids. The vessel is provided with at least one compartment having a bottom and sides forming a pocket in which one or more containers of slow-to-freeze, slow-to-thaw gelatinous material may be placed. Support members are attached to and support the compartment so that it does not contact the bottom or walls of the vessel, allowing liquid in the vessel to freely flow around the bottom and sides of the compartment.