[ZenGum]

If'n it's not too late, I suggest ...

Don't indulge in the "last drink" attitude. You're making a break, make it clean. Don't be dragged reluctantly into your healthier future, walk boldly into it and embrace it.

If you want to do something dramatic, go (with a friend/witness) to a bar, order a glass of whatever, then look the drink square in the eye and pour it down the sink.

"I will NOT drink you! You have no power over me. IT ENDS HERE! "

Then tap your heels together three times and say "I want to go home with David Tennant".

That ought to do it.