Just like any other addiction, the control measures are almost the same. First, the person cannot stop taking alcohol within one day, its always a gradual process. If he was taking two bottles daily, he can start by reducing it to one, then half a bottle and with time, alcohol will just be a history.
Secondly, peer counselling can really help the person. He might have forgotten the dangers of alcohol on his health and social life as well. Its good to remind them that alcohol can cause lung cancer among other effects.
Finally, idol mind is the devil's workshop hence it's necessary to keep the person busy. Engage him in some indoor activities and soon he'll forget about alcohol for quite some time. Doing this oftenly can help so much.