There's no reason not to drink water with some flavoring in it. In fact, it's PREFERABLE to drink flavored water IF

- the flavoring contains vitamin C

- the flavoring does NOT contain caffeine or any other known diuretic (you local health food store can tell you whether your herbal tea has any diuretic component; many herbs do tend to act as a diuretic so you should check)

- the flavoring does not contain aspartame

- the flavoring helps you to drink your water.