Sorry, even though I've been homeless multiple times I've always been fortunate enough to have a vehicle and ID
If I had to do it all over again and I did not have a vehicle I would probably find my nearest Catholic church and ask them for some assistance.
A few weeks of semi-stable homing would be enough to get me my start again.
If I was radically anti-religious on top of that, I would suggest attempting to beg for money to buy or, if you feel unable to beg, steal a tent and a bucket and hike out somewhere where I could establish a base.
From there it would be about establishing a space level of hygiene and normalcy and then building from there. Working for a fast food place should earn you the money needed to eat, and you can use water from the bucket to wash yourself and your clothes.