Of course many here are going to say quit for good and get it over with. But that's a daunting thought for many people, hence the slogan "One day at a time."
I think committing to thirty days is an awesome idea. Like you, I couldn't even manage facing that 1 day for the longest time. I also used to be able to control my drinking, but that ship sailed quite some time ago and it's never coming back. Do the 30, then reassess. I'll bet you'll feel great and be motivated to continue.
What's your quit date? How about tomorrow (assuming you've already started today)? That would be an awesome way to start the weekend, wouldn't it?