Water, it's like biological fuel. It is critical for all life processes and without it, life as we know it wouldn't exist. You might be wondering, "How can we running out of water? I mean water covers 71% of the earth's entire surface, there's plenty to go around right?"
As many of you probably already know, fresh water only makes up about 3% of entire water supply on earth. Only about less than 1%, is readily accessible, such as "ground water" and such. The other 2% is locked away in glaciers and the icecaps; So we can't just go up there, and put a stove under it and expect fresh water to fill our pools and wash our cars.
The other 97% is undrinkable without purification, which means that there's too mach harmful microorganisms, salt, chemicals, pesticides, or just plain ol' death in the water. Purifying it isn't that simple too, it's not a problem we can throw a few dollars at, and expect oceans full of clean water and smiling fish.
The demand is increasing (Population is increasing), and the supply is diminishing (Pollution, and contamination). So lets take a look at possible outcomes.