Making distilled spirits is an ancient process, and for 21st-century craft distillers--currently there are about 1,000 of them in the U.S., according to the American Distilling Institute--everything old is new again. And profitable. ADI's annual survey estimates that craft sales moved about 2.4 million cases in 2015, about 40 percent more than the previous year. From 2011 through 2015, segment revenue grew more than 40 percent annually.