@compmom don’t do it
We installed all sorts of helpful stuff for my mother, in our home, we had to tear out a bathtub and put in a walk in shower. She lived with us a decade, but once the dementia was undeniable, it became quite an overwhelming lifestyle. When she died, it was just a few months before my self imposed deadline as to how long I could keep doing that. It’s been nearly a year and I am still venting, slowly, residual feelings-mostly anger at all the siblings who could have even 10% more than they did and made her life (and mine) a little easier. I did not have time to whine, much, when it was all unfolding. It was a round the clock obligation, though, yes, I would sometimes leave her for an hour or so a day. And, yes, sometimes she fell then, but she often fell with a houseful of people, so it was a sanity measure.
What about a board and care home where she could get more individualized attention?
Does the drinking make her unsteady? Fall more? Angry? If it was just relaxing and not overdone, I would not fight it, but if it was dangerous, yah, that’s not good. What about giving her tonic water mixed with something to emulate the flavor?