I believe some of the water suppled to N.Y.C is from a reservoir in Vahalla, New York.
I remember some years back they did a test on N.Y.C. tap water and bottled water. N.Y.C. tap water tested better than 37 brands of bottled water.
That may not be true today but I am a believer that good water makes better tasting food.
IMHO - I may be wrong but some speciality items are defined by the quality of the water. As I traveled around the country, the quality of the ingredients that are used make a difference but somehow, the water is the common ingredient that makes thing taste better.
FWIW - I am not a gourmet and my taste buds are not very selective.