You should already know the answer to the world's most obnoxious question. ("Sparkling or still?") Tap. Thanks.
This week, March 16-22, these restaurants will ask you to donate one dollar for the delicious NYC water you usually drink for free. Each dollar will provide clean drinking water to a child for 40 days—unsafe drinking water is currently the second leading cause of death in children under five worldwide.
Go here for more info on the Tap Project, a UNICEF initiative.