In the Nordic countries, that's just a regular jail cell. Except the fridge I guess.
They're cold enough there
I spent a week in a hostel in Norway (Trumso). The room has a refrigerator, but no freezer. The food to be kept frozen was put on the shelf hanging outside the window.
Doesn't work if it's not winter. Also you should keep your food in a fabric bag that hungry magpies and seagulls can't open.