What would be your solution to the functional mentally ill?

There are some people around town that are homeless, the lucky ones have family to stay with, that are certainly 2 tacos short of a Mexican salad, but they are not so far out on cloud nine that they don’t know not to stand on the train tracks, walk into traffic, etc. There is no way they can hold a job (maybe with some powerful meds), they talk to themselves, or people invisible to the rest of the world, some physically abuse themselves, they wear the same clothes until it literally falls off of them, even if you give them newer clothes they seem to lose them. They know enough to tell day from night, what town they are in, where to go to get free food from the outreach, but having the mental chops to pay rent on time, and other bills, or doing laundry would seem to be a challenge. What would you do with these people if it were in your power to do so? Some get SSI etc. but how they manage their money (they do know enough to realize that card they carry has money after the 1st of the month.) one can only guess, after a few days they are broke.