The Berkshires aren’t just for the arts anymore. This corner of Massachusetts known for theater, dance, and picnics on the Tanglewood lawn has an alternative culture now: craft beer. Five craft breweries and their taprooms are conveniently spread out on a north-south axis so that a traveler is rarely more than 20 minutes from a fresh mug anywhere in Berkshire County. Most breweries distribute some beers to area restaurants and bars, but to taste the small batches or special brews, you need to go to the source. Each will sell you a tasting flight of four to five small glasses. Since brewmasters hate to get in a rut, beers mentioned below may or may not be available when you visit. Fear not: Something else will be equally good.