Thank you all, some really good ideas here. I will do some Googling to look for a grocery store near the venue this weekend, they are oftentimes in rather rural areas. Still I can bring a cooler with me.
I like some of the tuna/chicken and veggie ideas. I'm going to have to Google Quac, never heard of it.
oatmeal - still has to be instant I assume. I usually cook the whole oats in a crock overnight, so haven't had the 5 min version in years.