Hi, great question! I am not a doctor, nor am I a professional, however, my answer would be this:
There are many healthy beverages that can be consumed aside from water. Green Tea, 100% Fruit Juice, and Seltzer are all suitable alternatives. If you're trying to avoid (or should not consume) anything specific such as caffein, sugar, or sodium then certain alternatives are not suitable for you.
When I purchase seltzer water or juices, I am always very careful to read the label on the bottle. I take extra care to reading the "ingredients" because I choose to avoid sweeteners such as corn syrup and aspartame.
Reading the ingredients is very important! I'm always very wary of ingredients that can not be purchased on the supermarket shelf. If it sounds like chemistry, then it doesn't sound like something I want my body to process!
I hope my comment has provided a new light of understanding! It's a simple thing to consider!