I don't want to sound preachy, but it sounds like you have an alcohol problem you need to get under control. Consider trying to follow the AA model - find your local meetings, get a temporary sponsor, and try to do 90 meetings in 90 days. If AA works for you, your life will end up being a lot better no matter what happens with this charge. And frankly, if you keep a log sheet and document that you've done 90 meetings in 90 days, and continue AA at least twice a week afterward, your commitment to sobriety has a good chance of helping you with either a plea bargain or a sentence which may result from this charge.