You can try what I told my golf buddies. I told them my liver numbers were bad and I've decided to stop drinking. They never questioned me. If down the road if they ask, I'll tell them. I've decided to quit for good since it's improved my health and I want to keep it that way. While I believe honesty is best in most cases, I don't feel like telling them I'm a recovering alcoholic.
BTW, congrats on reaching 30 days. I recently passed that milestone and I feel great!