"...In such a case; be prepared.
Carry some extra items in just in case. a some blank tomes, some glue, a couple of short lengths of rope and a sack or two.
See if able there are are spells that allow the copying of texts. (Scriveners Chant and Kreighton's perusal might help).
Or if you find yourself in a city find an excuse to get away and pay a scribe to copy the text for you (or several if the tome is large).
It might also be easier to destroy the book as asked. Just ensure the binding and the blank pages of similar book are the only things burned..."