I was allowed to count everything as long as it wasn't a caffeinated beverage. It helps especially in the beginning to get to 64 oz. Funny though that I was considering next month to use it as a count for only water. Most of the time I am at 64 oz of just plain water and sometimes a little short, but I might have been drinking protein shakes or herbal tea so I get there anyway.
BTW, I am having a much easier time drinking my water and keeping track since I bought a 32 oz hydro flask (insulated bottle) that keeps my water nice and cold all day which is how I prefer it.