How bad is California’s drought? Bad enough to make farmers turn to tequila. About 40 farmers and distillers gathered last week at an inaugural agave symposium at the University of California, Davis, to explore the prospects of growing agave in California and making alcohol from it. Stuart Woolf, who grows almonds, pistachios and tomatoes, has a 1.5-acre test plot of about 900 agave plants at his farm on the southwest side of the Central Valley. … [I]t uses far less water than those crops. In Mexico it often isn’t irrigated at all. Early estimates are that agave in California can thrive on less than 1.5 inches of water per acre per year, compared with 48 inches for almonds.