This is Samuel and I have responded to your original question at the other post.
Unless this is going to be a "treatment facility" there is no special licensing required. Of course, you would need to check the local zoning laws and you would want it to be in a locating that is accessible to public transportation so your clients can get to treatment, counseling, work, etc. as they will not be able to drive and most likely would not own a vehicle.
Here is the TEXAS code on treatment facilities which explains what it is and you would apply for a license via the Department of State Health Services.
The code states the following on a Treatment Facility:
(4) "Treatment" means a planned, structured, and organized program designed to initiate and promote a person's chemical-free status or to maintain the person free of illegal drugs.
(5) "Treatment facility" means:
(A) a public or private hospital;
(B) a detoxification facility;
(C) a primary care facility;
(D) an intensive care facility;
(E) a long-term care facility;
(F) an outpatient care facility;
(G) a community mental health center;
(H) a health maintenance organization;
(I) a recovery center;
(J) a halfway house;
(K) an ambulatory care facility; or
(L) any other facility that offers or purports to offer treatment.
If you are not opening a Treatment facility and only providing a place for your clients to live while still in counseling, etc then no license is required. But you would want to be sure you have Rules and Policies establish that will apply to all your clients and if you have staff the same.
While the definition does state "halfway house" I suggest if you are not going to offer counseling, treatment, etc that you verify with the Department that you indeed to not need a license. That you are only offering housing.