Lots of interesting points have been made.
The last few days I have been imagining buying alcohol, the anticipation of the "feeling" of the first few sips when I bring it home but have been shutting the thoughts down as I thought they were unhelpful but having read the above posts as I guess it is a type of shifting?
Another thing I do which is a bit of a worry is keep remembering good but not much bad stuff about drinking. I am making a very conscious effort to think of the horrible destructive addiction which has controlled my life for so very long and not to keep romanticising it back to those first few sips.