Just a quick update to thank you all for your input. I found survival film supplies at Woodward camera. I did not have enough time to do as much as I would have hoped in Detroit, but it was well worth exploring. I saw the best street singers ever in the Eastern market, and met some truly wonderful people who talked very fondly of their neighborhood and what the city used to be. Was the opportunity to come up again, I'd go back.
Great to hear you had a good time. I forgot about Eastern Market... glad you found it.