Depot street brewing in Jonesborough, just a few miles from Johnson cityis a good place, just 1/4 mile out from town,next to the tracks, try the Eurail ale it's good.
Jonesborough is a very small town, the oldest town in TN, and you can tell it from the buildings.
They have a Festival on the 29 of June with great beers and entertainment.
Mellow Mushroom in Johnson city has a great beer line up and good pizza.
hope that helps
Bottled beer I'm not much help, but Food City stores have beer under 6 percent, a fair selection, any thing higher you have to get at a Liquor store.