Do or did they give the prisoners their own means
to grow food and drink water, or possibly through air drops? I thought he crazies and some others might be cannibals. The voice at the Liberty Island facility says something like "You have the option to be quickly terminated and cremated on sight." That's one reason it makes me think the prisoners had no way of getting food. Unless it was all the old stuff left before Manhattan was turned into a prison.
I could only imagine not bathing and the water to toilets being cut off.