Imo, if he's not drinking let him off for a while. Physically you could help him by encouraging him to keep a healthy diet at the moment. Lots of fresh food, with plenty of fruit and vegetables. As little processed food as possible, especially avoiding foods high in sugar, could be a big help to him.
Diet and nutrition is extremely important in controlling mood swings which can lead to relapse. Also, a good sleep schedule. Those are the main things that benefit the alcoholic when they go into a treatment center.