Bardering of any kind is still a sale.
I would recommend doing things proper, getting your permits & insurance required by almost all states. I would also, spend $100 on a little legal advise, hell some lawyers might give you advise for free.
You have to remember, if you do it illegally, you may face heavy fines & imprisonment. Which most likly would mean you wouldnt be allowed to brew again or own business with any alcohol products.
If you looking for a cheep easy solution, there isnt one. Believe me. Last thing I would want is to do is go into a bar and drink something that wasnt passed by FDA or whomever checks beer for consumption. At least when I brew I know whats in my drink.
Good luck though, its a dream worth going after!