Last year, I went to the CVS drug store up the street from the hotel and loaded up on canned soup, pretzels and Gatorade. Not the healthiest of eats, but it was sustainable for a few days, and much cheaper than eating out.
There's also a bit of discussion going on at another forum about the hotel not wanting any cooking going on in their rooms, so be weary of that when trying to bring in any cooking gear.