I used to get wasted before/during live tournaments and generally did quite well... It would get under people's skin that I was drunk and they'd try to eliminate me... Either because they thought my judgement would be impaired or to them I was obnoxious and annoying... This generally worked in my favour..
I don't use this tactic anymore but will still always have a drink or two when playing live..
I drink a lot when i play in live games..It doesn`t turn out well. I cant count on two hands how many times ive had a massive stack in tournaments, and then its all gone when the alcohol hits my head for real.
Online i normally self exclude myself when i go out for drinks. Previously i have donked away tons at cash tables when drunk.
3-4 beers, everything more than that is not good for me and my play(callin some hand which i shouldnt, playing out of position ,rising, bluffin...).In mine opinion better to take some coffe, soda or some juice...