I’ve got one of those Fire Tablets - I love it for reading books. I just need bigger print, something I can see more easily, in the kitchen.
For untried recipes in the computer, I have everything in word docs, too. Then, when they turn out well and are ‘keepers’, I print them, put them in page protectors, and they go in the binder.
You can certainly ZOOM the print on the Fire Tablet, or you can modify the font size before you email it from your computer to the Fire Tablet. I find good recipes on the internet, then cut and paste them into a Word document. I format the recipe, if necessary, to be more easily read. That includes giving it a bigger font. Then I save the Word document with a title, such as Eggplant Parmesan. I then email the document Eggplant Parmesan over to the Fire Tablet, with Eggplant Parmesan in the subject line. Easy peasy.
My mom with Alzheimer’s adores her kindle fire. She sleeps with it. It is filled with romance novels and she just reads them one after another and repeats them. When she walks by it she grabs it like a stuffed animal. And sometimes when she goes to someone else’s house she wants to take it with her.