I was going to mention stevia as well, though I don't know how good they taste as one kind I tried was absolutely disgusting. I had to throw my coffee out.

I do think microwaving tea is blasphemous, but whatever works!

Personally I love exceptionally strong black tea, and I'm on the hunt at the moment to find the perfect tea for me. My neighbourhood tea merchant is happily sending me home with one sample after another.

As for green tea, the better the quality, the lighter in colour. A lot of bagged tea (black or green) are basically dregs of the whole leaf variety and usually not the best. So, if you brew green tea and it's brown, it's pretty low quality (I might be wrong on this, as I know a lot of Chinese green tea are supposed to come out light brown).

I also find that really good quality Japanese green tea like sencha make me pee like crazy. Detox? Caffeine? whatever it is, I never drink it past 3pm.

I'm also drinking a lot of rooibos and honeybush. Non-caffeinated and substitutes quite well as black tea if I want something heartier at night. Rooibos chai is nice with the spices.

I don't drink very much water at all. I figure if I'm drinking good quality organic teas (both caf and non-caf), it's probably better than just drinking straight water.

Btw, about the decaffeinated tea, make sure it's not done so chemically. You're better off drinking the caffeine than the chemicals they use.