I'm so sorry you are going through this. You ARE powerless in this situation. It sucks more that I can say.

Having left my alcoholic husband after struggling with his addiction for 7 years (that's me struggling, not him. He was fine with it), I finally realized that we are all powerless to stop the ones we love from hurting themselves or killing themselves with alcohol. They will always find a way to get it no matter what you do. THEY have to want to change. Unless or until they do, there is absolutely nothing that you or anyone can do that will make a difference. I nearly killed myself trying to save my husband. I finally realized that some people don't have a rock bottom. Or at least, I hit mine before he hit his, and decided I needed to save myself - the only one I can save.