Cognac?
Or use skimmed milk? There are so few calories in the amount that you put in a cup of coffee I doubt that it will impact your fasting
Sadly there are loads of ("bad") calories in most boozahols!
Skimmed milk isn't ideal, as the calories remaining are mostly sugar, with the fat taken away; this is the exact opposite of the kind of nutrition that most fasters are aiming for. (I believe.)
My suggestion is to find hot drinks that are tasty without milk. What I've found palatable is;
- very very weak black tea
- black coffee (not great to be honest)
- green tea. This is a completely different animal to black tea! Give it a chance, you will probably like it once you stop expecting "proper" tea
- peppermint tea, lemon/ginger, other ... there are loads of flavours, you're bound to like one of them.
Anyway, that works for me. I can enjoy green tea, decaf milky tea, "proper" tea ... all in the same day.