You really need to understand that he can make this happen without a cent in his pocket if it has to come to that. He doesn’t need help, he is more than capable of helping himself.
And you don’t owe him, no one does. It does suck and I hate to see anyone go through wd it ain’t fun it is a hell not many can begin to imagine but it has to be done, you got to go through it and wd is really the easy part, the mental after is much harder… there are meetings, he can do outpatient on a sliding scale. He can just kick and in week put himself into the salvation army program which is free. He should call 211 and see what they have available if they are running in your state. It is a one stop shop for information and services.
There is also a big different between being tough and allowing someone the dignity of taking care of themselves.