Like a lot of other people here, I had an epiphany:
This person is on a self powered tour. He or she walks well established trails, while hauling minimal gear because each night is spent in the safety of a campground, every couple of days they stop at a post-office to resupply, and forward their real 'camping' loadout to the next stop. Bet they carry a cellphone or maybe a SPOT. Their choice to eat crushed snail-trail mix a couple of times a day. Eating that stuff, they only need the minimal TP, as it's likely only a twice a week habit for them. In a bad weather event, they know they have rations, warmth, and shelter to hole up for awhile. It's not survival as most interpret it. Survival is acting to get yourself out of whatever situation you find yourself in, these people revel in travelling by foot with as little as possible, but with a support system for resupply.

You too could do it with even less gear by making reservations at hotels along your route, and send packages addressed to you, at those locations, leapfrogging the packages, if you timed everything right, you could sleep in a warm room, in a bed, and have the luxury of running hot water daily.
You could pack pajamas in your boxes, so you'd always be able to
do laundry. You could take advantage of the sink and wash clothes, and possibly dry them with a hair dryer, rather than lug them around to air dry.
If you scheduled it right, you could even have a couple of hot meals cooked by others for your benefit.
All you might need is the clothes on your back, a fanny pack or purse to haul water bottles, cellphone, snack bars and credit cards. But it's not survival.