Most systems of tap water have water that is of equal quality to bottled water. I think the issue for people is more the taste, than the actual nutritional quality. I could be wrong though.

I would think that it's better to spread the water out, but that's more a common sense guess. Your body constantly needs water, not one big FLUSH. Right? Maybe a water expert will drop by.

Just my two cents... if only worth a ha-penny.