Actually FIV is not contracted through sharing of food, water bowls and the like. However, FIV–positive cats are frequently infected with other sicknesses, such as colds, which can get a FIV-negative cat sick, not with FIV but with whatever "secondary" sickness the FIV cat has. I talked a lot with my vet about it and have done some research...they actually have cats that live at the vet office who are FIV positive, and they reside with healthy cats and have no problem. This doesn't mean I am going to put my cats at risk. I am not bringing Mr. Raggs inside with my other cats. My husband and I will be getting a house soon and will keep him in a seperate room.
For now, we built him a little cardboard home out on the back porch with a bed, blankets and a heating pad.