We wash our bowls in this water

I guess one of the things that has been disturbing me for a while is the fact that water has become a commodity.

The Earth is a closed hydrological system. It has a specific amount of water. No more, no less. As mankind pollutes its own water supply we cannot make more. There are approximately 1.5 billion cubic kilometers of water on earth. It is believed that the process of photosynthesis/respiration cycles this volume once every two million years or so. The earth has the capability of cleaning our water, but not, I believe, at the rate we currently are contaminating it. The purification of water naturaly takes time. So the way I see it is, big business controls the water since it can now be bought and sold. Big business pollutes the available water making drinkable water rarer and more valuable increasing the value of their "product". I believe drinkable water should be a human right and not something that can be bought or sold. How soon before we have to pay to collect rain water?