Hi Deez, The only teas you are allowed are leaf teas. So any normal tea is allowed, peppermint or mint tea, green tea, (very bitter though) earl grey (but not lady grey as it contains oils of citrus) and definitely no fruit teas.
I am currently drinking fennel and nettle which I find quite palatable but I'm not sure if I should as I don't know which part of the fennel is actually used. However so far it hasn't seemed to affect my weight loss so I'll carry on.
You are allowed to used sweeteners as long as they are in tablet form and not the sprinkle type, ie Splenda etc.
Hope this helps. Cheers, Pat.