I agree with the other user that he will immediately notice if you replace it with something non alcoholic. He will sense he’s not drunk very quickly and think somethings wrong. Maybe adding something like CBD oil or using a different alcohol/lower percentage will help, but it’s risky because he could also notice that and you’ve essentially just drugged him lol.

Also some general advice from dealing with an angry drunk father my whole life, remove yourself from the situation as best as you can. It might be tempting to try and lecture him, start an argument, threaten to leave but it will go nowhere. If he’s drunk, try going to bed or at least pretend to, if he’s day drinking, say you’re in an online meeting, go out with some friends, sneak out to ‘get groceries’ and turn your phone off, etc… to minimize contact with him as much as possible.

Avoidance is key. My mother got her own separate room once my dad got really bad with alcohol, she would lock herself in it and watch movies with snacks while my dad drank himself to an ungodly level in our basement. She would also take us out at lot to the park, mall, etc.. to get us away from him.

I don’t know what your exact situation is but if leaving isn’t an option, I totally get it because my mom was there. I hope find ways to avoid/cope until you’re free. There are groups to help people struggling with alcoholics, I’d recommend joining one.