With cocktail culture all the rage at San Francisco saloons, the drinking classes inevitably will want to take their hobby home with them. So where do you track down the fine spirits needed for a do-it-yourself Sazerac or old-fashioned? It was the paucity of retail outlets devoted exclusively to decent liquor that led the proprietors of beloved S.F. speakeasy Bourbon and Branch to open their downtown bottle shop, Cask. The place is a paean to the history and culture of the hard stuff, with more than 150 booze-related books and an impressive selection of whiskeys, gins, absinthes, and other spirits. Whether you're looking for a high-end bottle of Pappy Van Winkle ($120) or the pedestrian but potent Old Overholt rye ($16), Cask is bound to have something to warm your belly and dull your senses after a long day.