I count any fluid, flavored or not. Actually I don't count anything, I just drink as much as I want. But as far as knowing I'm replenishing my body fluids, I don't care where it comes from. I do drink lots of water, but that's because I like it. Few things are more refreshing than a glass of ice cold water
For one thing, the original guidelines are for
fluid, not specifically water. I think the common reference to water is to make it easier for people to grasp or because it's readily available, but the body needs to be replenished with fluid. This fluid can come from anything - water, milk, oranges, green beans, roots and berries

On average, 80% of the fluid we need comes from water and other beverages, and 20% comes from food.
I personally think it's crazy not to count a flavored beverage just because it contains a few other ingredients other than water. Our bodies are too smart for that. Otherwise, by that same reasoning, any glass of pure water that you drink along with any food would not count. After all, when it reaches your stomach there's more in there than just water.
If you drop a slice of lemon in your water, does it not still count? If you ate 4 strawberries and washed them down with a glass of water, you'd count the water. If you pureed those strawberries and mixed them into your water, would you not still count your water? Did the water cease to exist?
