Newsday: Battles over water rights for survival and economic growth were dramatically depicted in the films “Chinatown” about Los Angeles and “The Milagro Beanfield War” about the American Southwest. The present-day story unfolding over water’s future may offer opportunities for investors able to envision it as a valuable commodity that benefits companies involved in its sale, distribution, purification and infrastructure. Corporate raider and oilman T. Boone Pickens …