This is part of my neighbor gift this year. They are really easy to mix up and the website has a sheet of labels to print. I printed mine on regular printer paper and used double-sided scotch tape to stick them on the jars. Here are the instructions from skiptomylou.org.
I found the egg replacer by Bob’s Red Mill at my local grocery store in the section where they have Bob’s flours. Here is a picture of what it looks like at Amazon.