In rural Africa, a single household spends an average of 4 hours a day fetching water. What do you spend 4 hours a day doing? According to this and this, U.S. kids spend that much time watching television on a daily basis. WaterAid provides more statistics here about the availability of clean water in developing countries.
WaterAid is a UK-based organization committed to providing clean water to the 1/6th of the world community's 6 billion people. They are active in 17 countries: Bangladesh, Burkina Faso, Ethiopia, Ghana, India, Madagascar, Malawi, Mali, Mozambique, Nepal, Nigeria, Pakistan, Papua New Guinea, Tanzania, Timor-Leste, Uganda, Zambia.
One thing I appreciate is their active partnerships with other organisations to achieve their goals. The sort of momentum created by united activity is encouraging. Here are a list, links, and descriptions of other organisations that WaterAid has relationships with.
Like Rwanda Clean Water and other good causes, WaterAid is committed to providing an extremely basic need, one that is more basic than "the pursuit of happiness."