I wanted to drink green tea, but was told no. I take theanine as a supplement, but was not allowed that either.
I know on the juicefast you can have herbal teas, but not on the waterfast, it is strictly water only i'm afraid, otherwise it is not classed as a waterfast.
On a short fast according to Braggs book, he allows apple cider vinegar and even a bit of honey in 3 of the 10 glasses of water he advises. The trouble is the concensus now is, that drinking all that water is not advisable now. He says that is loosens mucous in the body.
If i could drink green tea and herbal teas i'd be a happy bunny.