http://suprastock.blogspot.com/2009/07/best-alternative-energ...
Alternative Energy Stock #3 – PowerShares Water ETF ( PHO )
We're about to see a renewed emphasis on the rebuilding of our nation's water infrastructure. Now, there are plenty of companies serving various niche water infrastructure markets, but rather than trying to pick one, why not use a bucket?
The bucket in this case is exchange-traded fund PowerShares Water Resources ( PHO ), which gives you exposure to the best companies in the water industry. The fund has a solid balance of holdings, with no single stock representing more than 5% of the total portfolio.
If you want to make some green in your portfolio, then taking the aqua route is a good way to do so.