I am giving it a great deal of thought to allow my sister to take my baby.
Please don't do this. He'll have plenty of time to see the baby and develop a relationship with her once he's fully established on the road to recovery. Right now, the baby just needs her mama. She doesn't need to go to a halfway house to visit her half-interested father...
Being a single mom is hard and you deserve support - emotional and financial. But you aren't going to get it from him, not until he's stable anyway.