Prison provides food, water, clothing and shelter. We send people there to punish them.
a position or the state of being covered and protected
a shielded or safe condition; protection
a place giving temporary protection from bad weather or danger
The punishment of prison isn't free food and shelter, it's a lack of luxuries. And people survive for decades in prison, so obviously what they're getting is, by definition, enough.
Add love to that list and it sounds like a good life.