I find it interesting the reasoning of those who have been homeless in the past. The reasoning seems to be either “That is not ever going to happen to me again.” or, like me, “Meh, been there done that. I can do it again”.
I will assume I lose everything except my health, experience, & the ability to think, faulty as the last is. I will also go with the OPs terms, no friends or family.
This would make me want to live in a warmer clime. Waking up in the snow gets old fast. Thus, I would work on moving south & east. The western desert is very cold at night.
Getting a job is not hard, almost every other cafe or restaurant is in need of a “pearl diver” or a bus boy. I have even waited a time or two. I have been a cook, a job I would take, but only as a last resort. My hat is off to Chef Guy.
Mechanic shops also need grunts to do grunt work. I can change oil & clean parts. I can do much more but in a pinch, sweeping floors needs done. Hotels & motels need maids, janitors, desk clerks, & laundry workers.
Warehouses need swampers to load & unload trucks. Not only can I run a forklift, I can rebuild it & I enjoy sweeping out trucks. I can also load trucks by hand. All good skills to have in a “homeless” situation.
As far as having a good address, IME it is not needed. I have never looked one up while hiring & I have used a few bogus ones in the past. I always got the job.
A place to sleep can be found. I can stealth camp. KOA camp sites used to be cheap. BLM, The real one, Bureau of Land Management, land is free or cheap to camp on as long as you follow the rules. The homeless camps are an option but one of last resort. It is amazing where in a city or town one can find to sleep that no one will bother you. I personally prefer small towns or farmland.
Even as big and ugly as I am, hitchhiking works. I do smile a lot which helps. Junkers that do not run well can be had cheap. I have traded labor for a few just this last year. As a mechanic, these are cheap transportation as well as shelter or income.
Worst case, scrap cars are running about $150.00 a ton right now. So a scrap Honda is worth about $200.00 at the scrap yard. $200.00 is room & board for a week or two. Tip: fill the car with scrap metal found in alleys & creek beds. The yard wants this metal. Just do not increase the weight with brick or any non-metal items. The yards have seen it all & they will deduct for rocks & bricks. The same Honda full of trash is worth $50.00 a ton or less.
Scrap yards will buy loose scrap. I supported myself & my VW Baja with loose scrap for over two months. I made a good profit doing this. Drive around on garbage day before the garbage trucks & collect toasters, trampoline frames, washers, driers, bed frames, steel mop handles & anything metal. These items will have some plastic, so it will be bought at shred or baling scrap prices, closer to $40.00 a ton, but that money still spends. As you go you will learn what to separate out for more money.
I know a fellow in my town that does scrapping with a bicycle & a kiddy trailer. His rig was picked up separately on garbage days. He repaired them with tools & money from scrap he hauled in in his backpack. He got the trailer first. Now he is on the look out for a pedal trike. He will find one eventually.
I do not relish the idea of being homeless again. Yet it does not scare me, nor did I find it all that bad. IME securing the place to take a shower or bath was the hard part. OTOH swimming pools & gyms have them. Creeks work well in the warm months. Bathing with ice is not fun. Truck stops will let you use their showers for a few bucks or with a fuel fill up.