Most prisons DO have kosher meals, especially at the federal level and if they don't you can contact the Aleph Institute in Miami Beach to arrange for them to get them set up. For the commissary food items, there are limitations to what a "kosher registered inmate" may select from.
https://www.inmateaid.com/ask-the-inmate/do-they-have-kosher-meals-in-prison#answer
Accepted Answer Date Created: September 22,2012