It varies a lot, but for the most part it's just generic mass-produced cafeteria food. There's an article with more details on it here. It also includes some more information on prison life in general which may give your story more depth too
Edit: here'sanother article about a particular kind of (apparently disgusting) prison food given to misbehaving prisoners as punishment. Thought it might be of some use to know.
'Hush, hush!' I whispered; 'people can have many cousins and of all sorts, Miss Cathy, without being any the worse for it; only they needn't keep their company, if they be disagreeable and bad. — Emily Bronte, Wuthering Heights
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