Hermes, have you considered buying a clay tablet? It does not hold any fingerprints, given it is a dried one and you can pay cash for it. The content is a bit hard to refresh and new book upload is not as easy as Amazons wifi system, but OTOH it is not as easily traced as the Kindle.
If this is not what you are looking for, I suggest having a close look at the countless books written in the sand of the Sahara. They constantly change topics and will engage your mind for quite a while. They are not traceable, neither with new nor with old technologies and the lack of water will make it hard for anyone to follow you when you go out to find a new book.
Hope this helps
