On the outskirts of Bangalore one morning last summer, a sullen young man named Manjunath stood high atop a cocoa-colored 1,850-gallon tanker truck, waiting for its belly to fill with water. The source of the liquid was a bore well, a cylindrical metal shaft puncturing hundreds of feet down into the earth. An electric pump pulled the water up from the depths and into a concrete cistern; from there, a hose snaked across the mud and weeds and plugged into Manjunath’s truck.