I have to admit that I cheated at the end. I had a friend in town from SF and we went out drinking, which is, of course, not in the budget/not allowed as a food stamp purchase. I spent more in one night than I did all week.
Other than that, I think I did a decent job. I ate 3-4 meals a day with snacks of fruit & pb (although sometimes my "snacks" were pretty hefty, so that might count as a 5th meal). I actually have plenty of leftover food -- I probably could stretch the budgeted amount to 1.5-2 weeks of food. (I suppose then you'd get into the problem of keeping food fresh or multiple grocery store trips?) I even stayed away from all the free food at school.
I now have a better understanding of the food stamp "challenge" -- staying healthy while buying inexpensive foods that won't take too long out of a busy working schedule to prepare (and not grabbing a quick meal take-out!) and not being able to buy non-food necessities like toilet paper and whatnot on the government funding.