It's probably best to evaluate your needs and base a plan on that. Everyone is different, but the basic needs are the same: food, shelter, security, and mental health. Secondary (but also important) is gonna be things like transporation, basic hygene, and bulding back your income. Eliminate all expenses that don't relate to these.
Food: many religious places offer food assistance. Protestant and Catholic churches sometimes have no questions asked donations, I also know Sikh temples do Langar and offer food to those in need. Worst case scenario is finding fast food joints that throw out whole food. Big box stores also get rid of a ton of fresh stuff. A homeless friend of mine says that Dunkin always throws out perfectly fine donuts every night, for example.
Shelter: if you have a car, try buying some window shades and stealth parking. Places that are out of sight like hotels and big apartment parking lots. Campgrounds are good too in remote areas. You may get "the knock" to leave but at least it is out of the elements. Always park somewhere differnet every night.
Security: always be aware of the area you're in. Too rich and they will drive you away, in some cities arrest you. Too shady and you'll be in danger. Find an area wih the right "vibe" and dont stay in any one place too long. Trust your gut.
Mental Health: there's no way to sugar coat it; it's gonna be rough. But it is never permanant. With enough time and effort, you can get back up after every knockdown. Most have a reason to be here, to work, and to love, and that reason is why they fight so hard to survive. And if you feel like there is no reason, purpose can be forged from nothing too. Today will not be the same as tomorrow, and sometimes you simply have to wait out the storm. Keep this in mind when things get hard, and don't put mental health on the backburner, or it will be just as lethal as starving.
Once you secure these however, you can focus on cleaning up, and finding work/income. Restaurants are usually good places to work, wih down to earth types and simple labor. You can also head to your local library to access job sites and look around. Anything to at least give you some stability will work, bonus points if you find passion in it.
I hope some of this works for you, I wish you the best