That's one of the things that lots of missionary groups do, in third world countries, is teach people to use local resources to clean their water and stop the babies from dying.
/johnny
What's mind boggling is you'd think third world people would already know how to clean water, farm and preserve foods. That's basic survival skills known by mankind for eons. They should be the ones teaching those of us who have forgotten these skills. Never could understand why we've been teaching all this to them for generation after generation and they still don't get it.