Here is how we made our own worm food for our worm farm. We are in maintenance mode with our red wiggler vermiculture bins so we needed to make food for our worms. I explain the homemade worm food ingredients in this video.
Below are links to get you started. We do get affiliate fees if you use these links, but this helps our channel. Thank you!
Crushed Oyster Shells
https://amzn.to/37E4zrh
Whole Wheat Flour
https://amzn.to/2RzUqq4
Oats
https://amzn.to/38NvJMB