The Water Tank is an Epic Liquid Storage in Unturned 3.
The Water Tank stores water. Water can be put into the tank by left clicking with a Bottle filled with clean water (water that has been filtered with Purification Tablets or water collected from Rain Barrels). The tank has a capacity of 5 bottles, indicated by a popup when hovering over it, which says "Water Reserve: x/5", x being how many bottles worth of water are being stored. The player can take water from the tank by right clicking with a Bottle.