Some Californians are already showering just once a week, with buckets at their feet to catch every errant drop. They are building rainwater tanks in their backyards and replacing their lawns with mesquite and desert sage. They glare at water-wasting neighbors, and post photographs online to “drought shame” businesses that spray down their sidewalks. But a day after Gov. Jerry Brown announced sweeping mandatory cuts to water use, Californians said they worried that their efforts to scrimp and conserve were simply not enough in the face of a four-year drought that has drained reservoirs, robbed mountains of snow and raised concerns about an increasingly scarce and precious resource. In Marin County, just outside San Francisco, Chas Blackford, 64, […]