Can water from military surplus. Great conversation starter or part for your collection.

Pilots and sailors were in constant danger of floating adrift in the ocean. Whether the aircraft was shut down or the ship was sunk the US Navy wanted their personnel to have the necessary survival equipment to make it as long as possible while waiting for rescue.

One of the main factors in surviving in the oceas is drinking water. The US Navy developed a process where water was canned and distributed in survival kits. The cans were painted gray. 

item picture is exact item up for auction

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