I was in a CBT class for depression, and they taught us to make a list of pleasurable things you can do when you are feeling depressed. They call it "opposite to emotion" i.e. you want to crawl into bed at two in the afternoon, you go walk with your dog instead. I found this works just as well when I think about drinking. The key is to have the list made before the crisis, have things you actually like to do on it, and then when the time comes just will yourself to do it even if you don't feel like it. For me, the list also needs to have things I can do that cost no money or can be done late at night.
Hope this helps