I use OneNote, along with OneDrive, too. I just make sure to select the option to make the document available offline so that data isn't required to bring it up. I also attach the documents to my calendar items. For example, for our boarding time, I have it in my calendar and have our boarding documents attached to that appointment as well as our proof of vaccination. When the tests are completed, I'll add those as well.
I haven't considered OneNote specifically, but that's a great idea as you can put all of the necessary information together in a collection.