The reality is that most of us won't ever have to learn if we could survive entirely without any modern amenities. And what I mean is that most of us will have, at least, a shelter, and the sheer volume of manufactured clothing (at least in this country) will keep us clothed - even if the world turns upside-down. There is plenty of the flotsam and jetsam of the modern world to keep us housed, clothed and rich in utensils.
But as Naturalist, Arthur Haines, points out in this video, we have become something other than what our ancestors were - a weaker, more dependent version of a hominid species.
We don't know what we can eat without grocery stores and restaurants, and while we might recognize that all birds are edible, most of us wouldn't know the first thing about how to prepare the bird to be eaten, much less how to catch it so that we can eat it.
We don't know anything about plant lore and can't even identify the very things we eat on a daily basis, if they're not scrubbed clean and sitting on the shelf in the produce section of the store. In fact, there are probably hundreds of people who don't know that peanuts grow underground and coconuts grow in trees ... but neither grow in Maine.
Our teeth are weak from thousands of years of eating fire-cooked foods, and so, we need to cook our food before we can eat it. How many of us even know how to build a fire?
And speaking of fire, too many of us couldn't even keep warm, were it not for the power lines coming into our homes bringing us the spark that keeps things temperate and comfortable. And we're so fragile that we can't even stay cool (how many deaths are attributed to heat when the mercury climbs higher than is usual) without artificially cooled air.
Arthur Haines calls the modern man "domestica fragilis", but he points out that what we are is not what we have to be. We have a choice: domestica fragilis or neo aborginus.
Who do you want to be?