There were very few rules 14 years ago when I had full open-procedure gastric bypass. I was told what to eat and drink, which essentially included things with milk like cream soups and cereals. But I was never told no alcohol. Now, I want to stress that doctors and nutritionists know a lot more about the effects of different food and drink than they did back then. I wouldn't have had hard liquor for a long time because it's not my thing. But I would have had red wine--and I did--as soon as I was cleared for food like pasta and stew.
Even though I suffered no ill effects from my post-op diet, I can tell you it didn't come close to resembling what doctors require today. This may be science, or it may be insurance-related. But whatever it is, if you want to consume vodka or gin or whisky or even wine, ASK YOUR NUTRITIONIST first, and ask intensely, refusing what sounds like a pat answer. Ask WHY. Find out what the effect of a certain food or drink will have on your new gut.
You may deeply regret the indulgence. Or you may be fine. But in finding out, you're taking a risk you shouldn't take without learning all the information attached to it.
I've read a lot of nutty posts from people who ate stuff they shouldn't have and came to this group for support. Those folks generally didn't stick around more than a day or two. And excessive alcohol consumption is one of the factors listed among the reasons RYGB fails. I sure wouldn't want to go through that surgery, only to fail because I was in the mood for a martini a week or so later.