If it starts to smell or it is painful when urinating then go to the doctors as it could suggest something more serious.
Water is needed by your body, some like to get it through drinking tea whilst others get it through drinking it on it's own. Nothing wrong with it providing you don't go stupid with it (you can die from over-hydration, eventually).
Eight Glasses per day is a good amount, although pace it, there is no point in drinking as much as you can in the morning then having nothing until the afternoon.
As MattL suggested, in general clear urine is a good sign.