All very good points. In this case, I will assume the zombie population spread rapidly and there was only a rogue band of survivors so they should have plenty of foot, water and supplies. Two things I can't figure out:
1. There's only a few hundred or a couple/three thousand prisoners and staff in this facility. If these guys only whacked a dozen or two of the deadheads every day, they would have cleared out the prison long ago. It's not like they're difficult to kill...just a lot of 'em. It seems like they would want to clean house and securre their perimeter.
2. Why didn't they break out of prison or at least take care of #1.
I guess we will find out next week, same "Dead" time, same "Dead" channel.