If they stay at the prison I would be working on ways to avoid being overrun. There are so few of them and such a large prison that they could actually have 'caches' of food and supplies in a couple other areas that they could get to if needed - and seal off the area that was overrun. Put up some fencing or rearrange the fencing that is there. Glen showed us that there are welding tools. Make the prison more than just a prison. Make it a fort.