Pssst. Ready to water that beautiful lush lawn of yours? The one that’s the envy of the entire neighborhood. If you live in Southern California you’d better wait until after midnight. Preferably on a cloudy, new-moon night during a power outage when it’s so dark even night-vision goggles won’t give away your position. Otherwise you could wind up the star of the latest drought-shaming video posted on YouTube or Twitter. “Yeah, I put your address out there. The world is watching a lot more,” says Tony Corcoran, one of several people who spend their spare time these days canvassing the...