my first instructable about how to made seitan: https://www.instructables.com/id/How-to-make-seitan/
Just buy vital wheat gluten online, or ar some Whole Foods stores. After that it's just add the liquid...I always season it well....knead....stretch out into cutlets...simmer 30 - 60 minutes in seasoned liquid...and it's all set to use as you like.
This is much cheaper than purchasing ready made.
Try this recipe.
Thanks a lot Kiteman. I have to try to find a source for vital wheat gluten now. Be well.