Serious Eats: New York
Tap'd NY, New York City Tap Water in a Bottle
Why buy bottled water from faraway sources when you can get bottled water made with local water? New York City tap water, that is.
Tap'dNY is selling bottled purified New York City tap water, but they encourage you to drink regular tap water over the bottled stuff. More information about bottled versus tap water can be found in their blog, Truth in Hydration. Maybe you'll get help from one of their Hydrators the next time you run out of water while in the park.