When we traveled to Philly we discovered Wawa. We do not have Wawa in our next of the woods so make things simple assume a Wawa is like a 7/11 type store. We were impressed with what Wawa did in the city donating water to all of the people who came to hear the Pope last fall. Many, many, many pallets of bottled water lined the streets to be given to the people who attended. Looks like they are giving back to Philly again this summer!
More information here: http://www.welcomeamerica.com/calendar-of-events/category/free-museums/