Is it OK to drink alot of Arizona Diet Green Tea?

I drink about a half a gallon of Arizona Diet Green Tea with ginseng a day along with about two bottled waters. Just wondering how much caffeine is in this product per serving? I have been drinking this tea for about a year now and love it! Is this tea OK to drink alot with the below ingredients? Here are the... show more I drink about a half a gallon of Arizona Diet Green Tea with ginseng a day along with about two bottled waters.
Just wondering how much caffeine is in this product per serving? I have been drinking this tea for about a year now
and love it! Is this tea OK to drink alot with the below ingredients?

Here are the ingredients:

Premium Brewed Green Tea
Honey Citric Acid, Vitamin C, Natural Flavors, Sucralose, Acesulfame Potassium,
Ginsing Extract.

Thanks
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