Have you ever heard of Caffenol-C process? It is an alternative developement process for black and white film (you can develop color as well but the result will be monochrome) and photographic paper. About one year ago I started shooting on film with a Minolta X-700 and while looking for developement tutorial I found an article about this method. I won’t spend a lot of words about the process because there are a lots of very detailed pages about it. For instance I suggest you to visit Caffenol.org if you want to learn more.
All you need to know in this post is that this process involves instant coffee, vitamin-c and washing soda instead of usual chemistry. And the result is not bad at all, here are a few pic I’ve shot on a medium speed film (Ilford FP4 ISO 125) and scanned at home with an old Epson Perfection film scanner. The only edit is curves adjustment for the contrast.