Definition: A "water wagon" is a type of vehicle, often a cart or trailer, that is used to carry water. It can be used for various purposes, such as providing water for soldiers, workers, or even to sprinkle water on dusty roads to keep the dust down, especially during hot summer months.
A "water wagon" is an important tool for transporting water in various contexts, from agriculture to military use. It can also have a metaphorical meaning related to abstaining from alcohol.