Manhattan has the cleanest water in the country. Cleaner than any bottled water. It has flouride too. No need to buy water if you live there.
I drink tap water. I put it through a Brita filter. Drinking only bottled water can have hazzards. You need flouride for your teeth. Also, if the water has been frozen in the bottle you are at risk for cancer.
Ideally, drink what ever water you can get your hands on. Water is always the best alternative!