Yep..... just what I was going to suggest. A nice, lengthy CBA. I don't know if you have ever done one. If not, then take some time to clear off a table, sit down with some nice blank paper (4 notebook style pages will do), a good pen and relax. Make sure you don't have any time constraints, so you don't get the urge to go off and running or make up some excuse why you can't at least get started. Once you do, the ideas will flow rapidly and you'll quickly fill your pages. Mongo's outline is perfect.
Page 1: Benefits of drinking
Page 2: Disadvantages of drinking
Page 3: Benefits of not drinking
Page 4: Disadvantages of not drinking
Then, say you have a few items listed under "benefits of drinking". You then challenge those answers as irrational beliefs. Say, you drink because of anxiety or to take the edge off. Is it a good enough excuse? What else can you do? You get the drift. You don't even need to tackle this part right away. In fact, you'll find the benefits of quitting and the disadvantages of drinking far outweigh the others, and it may be all the inspiration you need.
After a good, thorough CBA, follow it up with some reading about the detrimental effects of alcohol (EDUCATE). Undoubtedly, this will give you more ideas to add to your CBA also. Post it here if you like!