Milk (as said above) or cheese is good. I think it's due to the way alcohol is processed, cheese cuts into how much alcohol gets processed, somehow (I'm no scientist but I remember hearing that somewhere).
More generally, practice makes perfect (although 19 pints is pushing it). As long as you don't zip from one pub to the other you should be fine, I've known people to drink a whole bottle of whisky over a long period and only get slightly drunk (yes, I know it's very unhealthy).