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Does tea still count as water?
I mean, diversifying a little is always good, right?

No, because tea may alter the structure of the water.
As a result, you will not enjoy the benefits of water.

Depends on the tea ;) There is a lot in tea, for example coffeine. That is not that healthy, too! But a cup or two a day does not hurt. A liter tea from real tea leaves... may have a bad influence.