There are some very high quality treatment facilities in Michigan, unfortunately, Michigan does not support parity legislation and as such insurance providers are not required to provide an equivalent amount of treatment funding for substance abuse treatment as they would for physical health treatment.
There are however other options. For those without insurance and without enough money to self finance a stay at rehab, the state government will sometimes subsidize your drug treatment care, and you may be eligible for this state funded drug or alcohol treatment even if you do not currently qualify for Medicaid.
There are also a number of free or very affordable charity drug and alcohol rehabs throughout the state, and if you have nowhere else to go, they will always take you in. You may not get luxury, but you will get treatment, and you will get better.