Black coffee all the way my friend! I know it's easier said than done. I resisted for a long time, but finally took the plunge ;-) when doing a fasting diet that allowed only water and black coffee outside the eating window. Now it's stuck.
In hindsight, I think one of the smartest decisions I made for myself was to first try coffee black. Since I didn't know any better, it was extremely easy to commit to it, and I am appreciative of it today. I wish I could influence more people to do it at their age, because I think a lot of people would appreciate it when they're older.