Usually I'm Mr Bust out with the mirror but this appeals to my sense of humor, this next bit
Tell him he can drink 2 drinks, thats 2 beers, 2 glasses of wine, or "mixed drinks" each with 1.5 oz of alcohol ONLY or it doesn't count for thirty days.
Tell him if he can do this you will NEVER say another word about his drinking for the rest of your/his life.
Bet him he can't do it because he is an alcoholic. Alcoholics takes bets and challenges faster then Oprah eats Ice Cream cones.
Alcoholics are unable to do this, they can actually quit or go on the wagon for years at a time in some instances, but alcoholics cant drink two drinks a day for thirty days, they can't. The Alcohol sets off their allergy.
If he is able to do this, he is a "heavy drinker" and you may have to rethink your strategy.