A cool water jug is a container designed for holding and dispensing water. It is typically made of plastic, glass, or stainless steel and can come in various sizes and shapes. The term "cool" refers to its ability to keep water cool for extended periods of time, often through the use of insulation or ice packs.

A jug is a type of container commonly used to hold liquids. It has an opening, sometimes narrow, from which to pour or drink, and has a handle, and often a pouring lip. Jugs throughout history have been made of metal, ceramic, or glass, and plastic is now common.