All I would say is that when I stopped buying alcohol when I went shopping I was absolutely dreading the response when I got back....and do you know? There was no response. There was no arguing.....
He said "haven't you forgotten something?"
I said "yes, babywipes". Left it at that.
It's the fear of more insanity that manipulates us to keep buying it.
When you go shopping next time and he asks you to buy it, have plan A ready....Yes, I did forget to buy something (make it anything but Alcohol)-deliberately forget to buy something else to make it easier for you to say it convincingly.
If he makes an issue about you not specifically buying the alcohol then it's plan B. All you have to say is something like....
"Yes, that's right. I didn't buy any. If you want it, I can't stop you from buying it, but I'm not buying alcohol any more"
Practice saying that to be strong and believable, because he thinks that you'll carry on buying to make it calmer at home, so no boats are rocked.
I have been there and done it, so can you.
And yes, that means you going without it in the house. Don't think you're being clever by buying it for yourself and 'depriving him' - if you want it, get it elsewhere.
Don't be looking to see where it's hidden, either. Don't pour it down the sink when you do. They will always have more stashed away.
Don't quantify/explain/say anything else - Do Not Engage in Dialog. Subject Closed. Move On. Alcoholics will twist your words, they will have you doing the inexcusable, believing the most ridiculous things.
Good Luck - oh and Happy New Year to New You's....It Will Get Better, please believe me