The Salvation Army programs are free and they have several different kinds of programs with varying times. I know of one not far from me that is a year long program in the country and the residents work keeping the property and land as well as their program of recovery.
They may have others like this, worth looking into.
I hope your friend follows through on this. A proper assessment and treatment plan for bi-polar may depend on his sobriety.
Once you find places that fit his requirements, he will need to be the one to make phone calls and arrangements. I don't know of a single facility that will accept anyone based on a third person's request (unless the person is underage).
Good luck, I hope something good comes of this. But please be very careful of your own involvement. Most of us began by doing "small favours" and then began to see ourselves as "the one who would save the addict".
Hugs