Can you use decaf as a high percentage of your daily hydration ?

RememberReach47
What I mean is that a cup or 2 of high caffeine drinks such as strong coffee and green tea (my two favorite caffeine drinks) isn't bad as long as your drinking a lot of water or mostly water based drinks, such as water obviously and also things like rooibos tea (or redbush tea) which is caffeine free.

But can you use decaf green tea for example as you would water or other caffeine free water based drinks ?
Can you use decaf as a high percentage of your daily hydration ?
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