I'll be taking part in the 100km YuCycle route on June 5th, mostly as a fun challenge however will be collecting donations to support Global H2 too. From their site:

'Our goal at Global H2O is to provide clean water sources to communities through construction of wells, rain harvesting facilities, and spring boxes. We contract with organizations in developing countries to identify where we can significantly improve lives in a short period of time, with minimal expense and complexity.
A $20 donation provides clean water to one person for the rest of his or her life.

The water problem is vast, but the solution is simple and effective.'