Most people drink plain water during a water fast, but you might also consider: u003cbr/u003eu003cbr/u003eherbal tea (ginger, peppermint, chamomile u0026amp; etc.)u003cbr/u003egreen teau003cbr/u003elemon wateru003cbr/u003eblack coffee (regular or decaf)u003cbr/u003eu003cbr/u003e The answer is that it’s really about what you’re comfortable with doing. My husband did not drink coffee because he was using the fast to help detox his body from caffeine and sugar. If you are fasting while guided by your medical professional, it’s best to ask your medical professional if you should still drink coffee while water fasting.u003cbr/u003e