What once was a clean stream with potable water is now a cesspool filled with dog and human waste. I am teaching this communities how to use old barrels to compost most of this sewage, to make compost toilets out of old trash cans, and to urinate in connected water bottle pipes into a separate large dark water bottle. These are S.O.L.I.S. Sterilized in the sun. If you don't mix the urine and feces, the odor and flies are minimized. They are shown how to build a fly and mosquito trap from a reverse cut water bottle. After a few weeks, when ready, they will use the clean compost and diluted sterile urine as fertilizer in their community vegetable and fruit tree gardens.