Abstract: A chiller reservoir is provided for use in a water cooler or the like for chilling a supply of water, and defines a substantially enclosed volume having a refrigerated outer wall carrying a chiller coil or the like for chilling water contained within the reservoir. An inlet port at a reservoir first end admits water to a central inlet tube for discharge into the reservoir near a reservoir second end. A plurality of spaced-apart baffle plates are mounted within the reservoir and have apertures formed therein to cause the water to flow from the reservoir second end along a direction-changing path back toward an outlet port at the reservoir first end. This direction-changing path directs or guides the water to flow toward and/or against the refrigerated outer wall, or against an ice bank formed thereon, for improved and relatively rapid chilling.