All wonderful experiences and advice. I myself, am an ileostomate. I drink on average anywhere from 3-6 beers a day. On the weekends, I buy a case of beer and it lasts me all weekend.
I don't go bar hopping as I'm not looking to hook up with random women anymore and it's cheaper to drink at home. Plus you don't have to worry about emptying your bag in your own bathroom.
In my experience with drinking beer, it does produce a lot of gas and increases output. So when I drink 3-6 beers in the evening, I usually have to get up around 3-4 AM to empty my bag and relieve myself. Luckily my brain wakes me up to go to the bathroom where others may have to set an alarm or something. And even after the 3-4 AM empty, I'll still wake up sometimes with a football on my stomach to where I have to lay on my back and burp the bag before I attempt to empty it again.
I have gotten sloppy, fall down drunk with my ostomy but I was always able to manage dumping my bag without making a mess. But I wouldn't recommend it. Throwing up always sucks.
Beer and carbonated drinks produce a lot of gas where as wine and mixed drinks not so much. And yes, hydration as mentioned is key. It doesn't hurt to down a bottle of water or gatorade after a night of drinking.