Unsweetened 2 cal tea isn’t a problem - I incorporate mint tea in my fasting, and it is considered a clean fast. Chamomile would also be considered clean, clean meaning not interrupting autophagy. Ginger is great for your eating window, as you’ve already planned. None of those should hamper your weight loss 😄
I do the exact same IF schedule as you. I eat keto during 4-8pm with a calorie deficit. 🙂
I enjoy 1 to 2 cups of hot tea during the day, and it has had no impact on my weight loss. I also enjoy a cup of hot tea after dinner, before bed.
A person with no pre-diabetic symptoms, can get away with having a variety of low-calorie drinks during fasts, because their insulin goes back down very fast.
If not so, then I would hold off on that ginger tea for now.
The other two are great regardless in my opinion.