Water supplies in many countries all over the world are likely to dwindle in coming years due to a number of factors. Check out some of these past articles:

Pollution Disrupting Earth\'s Water Supply

War Over Water

The real water supply problem exists in Australia, where it is projected that major cities like Perth and Sydney have somewhere between 1-5 years supply of water left (depending on how the situation is handled). Because of this, Australia will no doubt be at the forefront of new technologies aimed at curtailing the problem.

Australian Drought Towns Run Out of Water

Running out of water - and time

CSIRO

Water, Water Everywhere...

Jared Diamonds book Collapse also covers this bleak topic pretty comprehensively.

Maybe we need to harness one of these babies...

Orion\'s Water Factory