A time to let loose, put your toes in the sand, do whatever you want because it’s Brat Season. The sector includes hard seltzers, flavored malt beverages, canned cocktails, and canned wine—basically, anything that makes it more convenient to drink something other than beer straight out of the cooler. Blake Lively’s Betty Booze brand boasts “gourmet cocktails,” and the NielsenIQ …