I'm on my way to cheer camp I need ideas of food to buy?

We are stopping at walmart when we are half way there. We will be at camp for 4 days and I need ideas of what to buy. I have $40. There is a fride and microwave in the rooms. I am already getting hot pockets and cheese sticks. We eat dinner at 5 everyday and I know I will get hungry. I have a few roomates so any ideas?
 
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