I'm usually a certain weight, give or take a few pounds.
last year I had to work away a lot and although the work was over a computer (just needed to be in the district) I had a lot of free time in evenings and really got into drinking wine.
after around 3 months I had gain a stone.
my diet and activity had not changed, in fact I was more active - and it was NOT muscle!
when I packed the wine in, it fell off. so if you are bothered about weight gain (which you don't have to be!) there's some data.
I often buy two jack Daniels mini's of an evening. I have them with ice.
I always feel, if its more than 3 times per week, that it gets in the way of things, like yoga, meditation, art (my job) and other stuff.
there's often a correlation between stress and regular drinking, even if you feel happy. for me personally more than 3 times a week is too much for my self balance, my health.
a bottle a night won't seem much if you're used to it, but it depends what you want and what you perceive your future to contain.