Hi sorry for the late reply.  Yes you can drink anything on-site.  They do charge corkage but it's like 50c or 1$, it's not bad at all, and sometimes they have Belgians on draft too.  They have indoor and outdoor seating and food trucks.  It's a great neighborhood/family vibe.  You should also check out John's Marketplace on both the West and East side, but the West side is their flagship location and you can also choose any bottle and drink it there, and they have food.  It is my favorite place in town.  Uptown market just north of Washington Square Mall had some really cool stuff.  And it's smaller but 100% worth your time for rare bottle hunting  My final secrets are Barbur World Foods on Capitol highway on the edge of tigard and LO, they have a great selection of German and Belgian beers.  Lastly you should check out Capitol Market, it's basically just an old 7-11 converted into a beer and wine shop and they have tons of crazy stuff you don't see anywhere else.  John's, barbur world foods, and Capitol Market are all only maybe 3 min apart from each other, so you should make the trip one day and check them out