Green Tea >>> Yep, for sure. I drank loads and preferred the green tea mixed with mint tea.
Not familiar with White Tea, but can tell you that any LEAF teas are permitted , the petal teas are NOT.
Do you have good losses? There are times I'd like lemon but i have it stuck in my head that lemon/lime can take some of us out of ketosis so i don't risk it. (they used to say it did on Lightet Life)