A Water Copper Steel Serving Water Jug is a type of jug used to serve water, typically made of a combination of copper and stainless steel. The jug usually has a copper exterior with a polished or hammered finish and a stainless steel interior that is resistant to corrosion and easy to clean. The copper in the jug can help keep the water cool and also has antibacterial properties. The jug is often designed with a wide base and a narrow neck and comes with a matching lid.