Rocketbar, located at 36 Lansdowne St., has about what you’d expect from your corner deli: beer, soda, and some not-so-low-calorie snacks. Don’t come here expecting a night’s worth of entertainment, but hey, at the very least, it should have the basic tools to get your evening started. The price for a six-pack is probably a little higher than what you’d pay in a suburban grocery store, but that’s what you get for living in the big city…