I've also worked in conditions where I lived in a 1/4th of a trailer with a half-height locker and whatever I could keep in my top bunk with me -- I shared the space with another adult. I had a few sets of clothes, a jacket, no internet or useful entertainment and 3 shipped in boxed cold, marginally nutritious meals per day. I didn't die and I'm sure I could lose many of those "luxuries" and still not die.
Once when my parents made some bad financial bets, we ended up homeless and living in a motel. It turns out a family of four really can live in space not much bigger than a foldaway bed, a small bathroom and a hotplate. Amazingly, even after months of this, none of us died. I'm sure we could have gone even more spartan if we had needed -- maybe share the bathroom with a few other rooms? Combined instant noodle hotplate cooking area with some of our neighbors? Why do we need heat, just wear more clothes! Don't need a/c, just wear less! Don't need heat or a/c, don't need electricity then, use a butane stove instead of a hotplate! I guarantee, we wouldn't die.
Humans need remarkably little. Most humans would get along just fine with two sets of clothes, a marginal blanket and a decent cold meal of daily calories every day. And yes, they'd get along for quite a long time like that. It would be a wretched, terrible existence, but "need" doesn't leave room for pleasantries.