Good article, with detailed instructions and good pictures.
This is not hard to do and cans are readily available (right now). The cans can be cared for and will last a long time if not allowed to rust.
http://www.bioprepper.com/2018/03/12/make-bread-can/The recipes are simple and some of them are suitable for use with prepper food stocks. Remember that yeast can be harvested from many plant leaves. This is important in a post-event world. You can also maintain your own sourdough starter which potentially can out-live you.