There should be a lot of food options at RTM right by your hotel then. They have their own website:
http://www.readingterminalmarket.org/
That should definitely be a good option for getting fruit for snacks. Unfortunately, we get in after 6 on Friday evening, and it's only open Saturday and Sunday. We should be able to find stuff to eat.
MandCMomma, I'm noticing more homeless in DC and pan-handling at intersections has picked up even in the outer suburbs. It reminds me of when I came to school in the late 80s. It had improved in the 90s.