>>222018I have a few books on wild edible plants.
The thing is, besides a small few root vegetables and fruit, basically all of it has almost no calories and won't keep you alive.
Mushrooms are even worse, because not only do they have close to zero calories but a single slip up in identification can kill you or make you extremely sick. Making mushrooms not worth even looking at in survival situations.
Like a pound of the stuff will have around 10 calories.
It isn't worth your time.
Fruit, etable roots, meat.
Those are the things that have enough calories to keep you alive as well as worth your time and effort.
All other plants could be seen as seasoning or vitamin supplements.
That said, this isn't homeless advice.
Homeless advice would be to just go get free food that is handed out to homeless and poor people, which is a thing in all developed areas and even most deloping areas, or dumpster dive.
It's a far easier, more consistent, and depending on time of year, higher quality source of food.
No need for theft at all.
Honestly food was never the hard part of being homeless. It's a tossup between the weather, people, and utter lack of security/stability that is the hard part.