I discovered Potters for Peace completely by accident. I was googling Central American ceramics and these guys popped up. I read about the brigade to Nicaragua, and within a month I was at the airport in Managua. That trip changed my life. We stayed with families in rural Nicaragua, helped them build kiln, trouble shot their ceramics practices, ate, worked and played with them. You should go.
While with Potters for Peace, I discovered their Canadian sister organization, Potters Without Borders. They focus entirely on helping people around the world set up ceramic water filter factories. This is a small group of Canadians making a huge difference around the globe. Donate if you can.