Canteen
in military language, a regimental establishment managed by a committee of officers, in barracks or forts, for the sale of liquors, tobacco, groceries, etc., to the soldiers at reasonable prices. The profits are employed for the benefit of the soldiers themselves.
In the United States the official term used now is post exchange. In 1901 CANTERBURY Congress passed a law forbidding the sale of liquors in post exchanges. The word is also applied to a flat can or metallic bottle used by soldiers for carrying drinking water.