I like to cook using my edge as a recipe book too, and I have two alternatives to doc and PDF depending on what is most workable for you:
-Image files, one per recipe. Using a screen capture program like FastStone or even just built-in Windows commands like Alt-Print Screen followed by a paste into MS Paint. Pictures can be accessed as file names or you could flip through them. This is a low-tech solution though and has it's limitations.
-epub file. There are free programs like Sigil for making epubs that are pretty user friendly and you would need to do little more than paste the text in and split each into "chapters." Epubs can be read on the eInk side and they not only reflow the text if they are long, but they can have tables of contents or indexs that are linked and would jump straight to the recipe when clicked with the stylus.