Small Water Bottle
The Water Bottle found in trash piles, and is used for the collection and transportation of drinkable water.
To fill, equip it and right click while looking at a source of water. You can then drink from it whenever you desire with a left click (make sure the water in the bottle is freshwater and not salt/stagnant water).
If the water in the pouch is not desired, or if you are attempting to extinguish a fire (not napalm), you can right click on the bottle again to dump it's contents.