Use a two-bath plain hypo as fixer. I would definitely not use any kind of rapid fixer, or you'll bleach the image right off the paper.
The first part of the process can be non-toxic. I use egg white, sea salt, and vinegar and mix this solution using my ordinary kitchen utensils.
Silver nitrate and everything after is toxic. Gold toning is traditional, but selenium toning also works. The image must be toned. Coffee will color the paper excessively. Tea might be interesting, but I haven't tried it.
Read Reilly's book, which you can download from albumen.stanford.com