A simple community well can mean the difference between surviving and thriving. Millions of women and children spend their days gathering unsanitary water, making education impossible. Sickness from unclean water prevents parents from providing for their families. Most of us in prosperous countries take for granted the fact that the water in our toilets is cleaner than what many are forced to drink. I have seen firsthand the joy that clean water brings to people who have not had it previously.
http://thesweetestthing-family.blogspot.de/2011/03/her-village-gets-clean-water.html
This problem can be solved in our lifetimes, so get involved with one or all these great organizations: