Potomac Grocer, an upscale market specializing in local, natural and organic foods, is finally making its long-awaited debut in Potomac Village. “We’re kind of like a Whole Foods or Balducci’s, but much smaller,” says owner Tom Spencer, noting that he’s put a lot of time into hiring the right staff. That includes two chefs — one dedicated to pastries, and the other focused on preparing meals to go. Potomac Grocer is on River Road next to Walgreens, in the space that spent decades serving horseback riders as The Surrey.