By Julia Burke, Beer Editor Buffalo's Community Beer Works received its TTB approval this month, taking the fledgling brewery one step closer to legit beerdom. Brewer and founder/owner Rudy Watkins was kind enough to send some prototype suds my way — technically homebrews for now, but previews of the recipes to be brewed when CBW finally opens later this year. One of the hottest nights of the summer seemed perfect for cracking a sexy sour, and knowing Watkins to be as passionate about sours as I am, I had a feeling I'd be in for a sensory treat. Watkins explained…