Sure, black coffee is fine, but I hate the taste of coffee, so I drink it with milk and Monin syrup
In that case, just take a caffeine supplement that has theine in it. It would be a lot better for you than coffee.
Suggestion: make better coffee.
I've tried V60s, high-end Espressos, still hate the bitter taste of black coffee. Any other suggestions?
Maybe cold brew? I felt it was less acidic and bitter when I used to make it. I have a Toddy and with that maker you end up with a concentrate that you dilute with either hot or cold water.
I can confirm that black coffee usually works just fine when doing intermittent fasting.