just ran a quick google search on "months long rehab centers on Long Island NY"... for instance a list of available places for adults:
http://www.choosehelp.com/newyork/drug-rehabs-alcohol-rehabilitation-programs
i was amazed at the number of places that are 60 or 90 days long. a lot offer sliding scale for self pay patients as well as stating that no one will be refused. Many options for transitional living as well are offered. I do know that finding a medical place to detox first is often a problem, but some manage to detox often wretchedly at a friends or a motel with a trusted friend/family member to guard them and call for help if it is needed. my experiences (friends, family and students) have been with opiates pain pills and heroin. not all have made it successfully, some have, some relapse and others opt for suicide. another outcome is they then go "on a run" and aren't seen or heard from until they resurface, for what ever reason.
I am NOT saying this is RM's option or problem but it is definitely available as an option.
imho and my personal experiences.