There's only one reason why a character drinks: to seek confrontation. To fight for what they want in ways normally denied them.
Michael ShurtleffThe actor needs to find out what the basic fight is in every character in every scene.
Michael ShurtleffWe don't live for realities, but for the fantasies, the dreams of what might be. If we lived for reality, we'd be dead, every last one of us. Only dreams keep us going...When you are acting, don't settle for anything less than the biggest dream for your character's future.
Michael Shurtleff