How does water from Sudan connect to the novel a long walk to water?

Salva Dut was one of those boys. As an 11-year old Dinka from Tonj in southwest Sudan, Salva fled first to Ethiopia. Then later, as a teenager, he led 1500 "Lost Boys" hundreds of miles through the Southern Sudan desert to the Kakuma refugee camp in Kenya. That courage and heroic perseverance continue to this day. Relocated to the United States in 1996, he now leads Water for South Sudan, Inc., the non-profit organization he founded in 2003.