Beer Superstore

How much should I budget for alcohol?
This is for a wedding of 40-50 people, and the bartender, and other mixed drinks, etc. are already covered. We are providing real alcohol (I know get Wholesale Superstore). Beer, wine, sparkling wine, and maybe a bit of hard liquor (but we are in a very small budget). What would it take and how much should it cost portion of alcohol? Thanks!
Our budget is about $ 300, and we thinking of getting cheap beer barrels, a little wine, some liquor and mixers. I would suggest beer (whatever people like, if not then barrels packaging of different types), red wine, white wine and a bottle of light brown and a liqueur. I guess every person will have 2 drinks per hour (or maybe my family are drunk?)
The Superstore Song