If you're in a situation where it's feasible to make soap, you won't need to worry about it. You'll either be in a stable community or safely isolated. In any other circumstance, soap won't be on your mind.

In a society with soap-making potential (this is a fun categorisation) you'll need materials and capability. If you're in that situation, I sincerely doubt PDFs are going to be useful unless they've already been printed and/or frequently discussed, i.e. books and stories.

Maslow's hierarchy of needs may have issues, but it's surely a useful heuristic.