I hate to put a dose of reality into this post, but here goes. I seriously doubt this man will go through with the detox. Just think about it, I mean he's ingesting just about everything except heroin/cocaine.
One thing leads to another, so he'd have to give up his shopping cart all at once. Good luck with that.
If this man is really serious he needs real treatment. The at home thing is easy to quit, and can be very dangerous. Please keep this in mind.
Best of luck to you, it can be a very bumpy ride. And while I'm not an addict (for real) I've been around it my entire life. I've seen the good, bad, ugly, and dead.
I do know a few who have beaten back the devil, but it was usually one devil.