Lol, not a silly question at all. I was wondering the same thing the other day.
Water myths & facts here says:
Quote:
A lot of our members ask if flavored water counts [towards your daily fluid intake, that is]. It's a fluid and it counts. If you don't like tap water, drinking flavored waters may help you drink more.
So, flavored water, like any other liquid, counts towards your daily liquid intake -- and those zero calories flavored water do not count as food intake or so.
Cool eh?
