I tend to drink mostly green and white teas. White tea seems to be less well known but it's even higher in antioxidants (though raw chocolate beats them all). Green, white, and black tea are all from the same kind of plant, they're just picked at different times, white being freshest/youngest, then green, then black.
If taste is an issue to you, add a bit of spearmint in (I've tried bagged green tea with spearmint added in for good effect, but lately I've gotten more into loose leaf teas). Also make sure you're only soaking the tea for a couple minutes, as the taste does change after that.
As for fasting on tea, a 4-5 day fast is fairly mild so it should be fine. If you google tea fasting you'll find people recommending a number of different teas, from "Fasting Tea, Yogi Tea" to Essiac Tea. Try whatever method most appeals to you.
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