Any disadvantages if I drink 8 cups of tea instead of 8 cups of water today?

I woke up with a sore throat and my coworkers this morning told me that drinking tea helps. I do love drinking tea and wouldn't mind drinking 8 cups of plain green tea (no sugar added), as opposed to the traditional 8 cups of water per day rule. Is there any disadvantages to drinking ONLY green tea instead of... show more I woke up with a sore throat and my coworkers this morning told me that drinking tea helps. I do love drinking tea and wouldn't mind drinking 8 cups of plain green tea (no sugar added), as opposed to the traditional 8 cups of water per day rule. Is there any disadvantages to drinking ONLY green tea instead of water?
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