You sweet, ignorant man. We always have snacks available in prison, boiled eggs with juice or a peanut butter and jelly sandwich. If you're allergic to both nuts and eggs, you can have a turkey sandwich.
Let me tell you who Chris would be in prison: He'd be the cunt who claimed he was "allergic" to everything until he got ice cream, figure out that exploiting conditions got you a private room in the infirmary with a TV, and because he has a dick, he'd be swarmed with girls.
I can see him making heart signs at his boo and screaming for someone to pop his door so he could scuttle over to see her. Chris would LOVE prison.
ETA: They also round every 15 minutes in prison. If some guard refused to give him a snack, some higher ranking officer would probably buy him something out of the vending machine to spare themselves the bitching.