General terms:
* Carboy: A large glass or plastic bottle, often used for storing liquids like wine or water.
* Canteen: A container, usually made of metal or plastic, for carrying water.
* Water bottle: A general term for any container used to hold water.
* Pitcher: A container with a handle and a spout, typically used for pouring liquids.
* Carafe: A glass container with a narrow neck, used for serving wine or water.
More specific terms:
* Cooler: A large, insulated container used to keep drinks cold.
* Growler: A large, reusable container, often made of glass or stainless steel, for carrying and storing beer.
* Water dispenser: A machine that dispenses water from a large container.
* Tank: A large, usually metal container used to store water.
The best word to use depends on the specific context and the size and purpose of the water jug.