All of life is dependent upon water for its very survival. Since the birth of human civilization, people have moved to settle close to water. People move when there is too little of it; people move when there is too much of it. People move on and across it. People pray for it. People write and sing and dance and dream about it. People fight over it. And everybody, everywhere and every day, needs it: for drinking, for cooking, for washing, for growing...