At the core of CE is removing processed foods from your diet and choosing unrefined, "unmessed with" better alternatives. If you are a tea drinker, it is preferable to chose green tea over regular black or Oolong. Why? Green tea isn't fermented in the production process, which leaves it's natural antioxidant powers largely intact. While black and Oolong teas are still healthy, green tea is more so. If you are looking for an additional beverage to add to your diet, green tea ( hot or cold ) should be at the top of your list.
Tea drinking in general has been scientifically shown to aid in digestion, increase metabolism, lower blood pressure and cholesterol levels, and is a powerful aid to your immune system. It's a win/win/win all around. The only drawback is caffeine content - if you are sensitive to caffeine, or are trying to reduce the amount you consume, be sure to look for decaffeinated teas.
Green tea does taste different than regular black tea - so for some, there can be an adjustment period...it is different. Buy a few different brands, and if you don't like one, try a different one. Also, make it easy for yourself if you want to incorporate regular tea drinking into your consumption. Buy yourself an "old fashioned" stove top tea kettle, or one of those counter top hot water heaters: Amazon.com: Sunbeam Hot Water Dispenser
If you can find it, I like the Lipton green tea with citrus; there are other flavors, too: