DannyB1954 said:Welcome to the forum. You will find lots of good info here. Much of it already written. There are links near the top of this page to some. Bob, (the owner of this site), has also done many tour and how to build videos. https://www.youtube.com/channel/UCAj7O3LCDbkIR54hAn6Zz7A/videos
I had a friend that used to stealth camp in his 4 door compact car using a car cover. He would park with a window rolled down, cover the car, then get under the cover and jump in through the open window. He spray painted the vehicle plate number on the back to make it less desirable to steal. Said nobody ever lifted the cover or called the Law Enforcement on him. If it was cold outside nobody could see the windows were steamed up.
On food, a lot of even small communities have food banks. There are three of them in my town. Hard to beat the price of free food.
For showers I use a weed sprayer. Here is how to make one I painted mine black with paint made for plastic, (is more flexible and will not chip as easy). I also cover it in a clear plastic bag when I set it in the sun, (acts like a green house).
I'm not too sure how that car cover would work for me in a Walmart parking lot. And many food banks require an actual address and a bill from that address in your name. At least the ones I know and been too.