Water. Water everywhere, not a drop to drink, as the saying goes. It's true that we find water everywhere, but consumable water is minimal. How can we expect a survival without water? It is high time that we be alarmed of this and take necessary steps to prevent water depletion. Water is the most pressure resource for the existence and survival on earth. Threefold of the earth's surface is covered with water. Out of this, 90% is salt water, unfit for consumption