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Fyi, I've heard health professionals, like Rhonda Patrick mentioned here, say that coffee and tea will still cause your digestive system to secrete enzymes that can undo IF effects, that you should only drink water during the no-eat window. I've given up my morning caffeine to do it.

Folks in the keto/fasting space seem to present salted water as a good option here

Also, bone broth, chicken broth and vegetable broth.

How does that work? Doesn't broth generally have calories?

No it doesn't and I suspect the broth is just to make the salted water taste better.

I’d say that getting adapted to black coffee (I previously took it “light and sweet”) was the hardest part of starting IF for me. Took about 2 weeks, but now I’m enjoying it.

Do you mean during the fasting period or when you are out of the fasting period? Can you consume sugar when you are out of the fasting period?