It's tough, but if you hang in there you can do it!
I found it helpful to focus not on "just one day at a time" but rather the opposite. "No coke, ever again, not even one, ever~!" This helped me say 'no'. I think 'one day at a time' kind of leads me to think "I'll have one tomorrow" and that everlasting (unfulfilled) promise of getting more doesn't really help. To me it was helpful to remember that I do not want that stuff in my body any more, and that I *KNOW* that it won't be "just one" if I do have one. I will cave. I will have more. One will definitely lead to one more, and one more. So not one, not ever.
I did have a few sips about 7 weeks in and ... gross!! Tastes like dirt. So if you can go 2 months, you might have it licked purely from a "yuk I don't want that" standpoint. I still crave it, but I really don't *want* it.
Deb, in New Zealand