Water runs a huge gamut of variations in our country and NYC is noted for some of the best (healthiest) drinking water
(a link on your water you may want to read). However, drinking water safety and aquarium safety, especially for inverts, are not the same. As an absolute minimum, even exceptional tap water needs to be dechlorinated and deionized (metals removed, the DI part of RODI water). Chlorine will eventually evaporate if left out but will be present in any tap water from a public supply and should NEVER be used without being left open overnight to remove the Chlorine. Since you are setting up a new tank and nothing will be placed in it for a long while, your set up people did not error with the Chlorine concerns but you cannot use water directly from tap for top offs after you have animals in the aquarium (this would be true of salt or freshwater aquariums). Fortunately NYC does not use Chloramine, a harder chemical to remove that can cause serious problems, particularly with the PH requirements for a marine tank.
Here is a nice article that includes info specifically about NYC water and aquariums as well a the problems with Chloramine - something Sabrina has to deal with in TX). Note that it does not discuss the DI (metal removal) needs for inverts.
Deionization, however,
is an oversight by your set up crew. For a fish only aquarium, the metals found in tap water are usually tolerated and fish are frequently treated with copper to kill parasites. Unfortunately, invertebrates (as well as most scaleless fish like dragonette) cannot tolerate copper, even in small amounts.
Most bottled drinking water (including Dasani) have been through the RO or RODI process (ie filtered) but minerals (including metals) are added back for taste and make it unsuitable for aquarium use.
Some stores (often saltwater aquarium stores, Walmart did at one time but have discontinued in our area, you might also check your grocery store) will have RODI water that you can purchase very inexpensively if you bring your own container but the maintenance of the RO and DI components is always suspect from a DIY filling station so if you purchase it, get at TDS meter to at least validate the reverse osmosis (RO) component is removing particulates (Total Dissolved Solids should = 0, my tap is 34ish AFTER whole house particulate filtering). Any RODI water should show a PH of 7 (neutral) that should increase to your tank's 8.4 when added.
Home units are great to have if you can dedicate a water supply, not usually viable in an apartment but non-destructive to a rental home with a spare sink. There are some smaller home units available for apartment use but are usually thought to be inconvenient and messy so most renters opt to buy their water.
At least one of our staff uses Deionized tap water successfully (CA). My water (GA) is totally unsuitable and must go through RODI filtration for both acid and particulates.