

I do get the thing of being stuck on the association of something with pleasure or such, despite knowing from repeated experience that it doesn’t actually work out that way. All I can say is keep reminding yourself of this.
The other suggestion I have is to try to find some other special beverage with which you can cultivate a special association.
It may be tricky to find the right sweet spot. It can’t be something too expensive, since it sounds like that will stop you buying it, but it can’t be so trivial that you just drink it all the time and it then fails to function as a substitute special treat. Possibly the effort of making it could imbue it with specialness. Kombucha is possibly a thing like that you could make.
“Who the fuck is McDiv?”