(I'm making this up to get you some spellcasting):
There is a practice that most Wizards find horrible to contemplate that is called Cannibalising A Spellbook. You can cast a spell directly from your spellbook without taking the time to prepare them, but it causes the pages to react like a scroll - it burns the words off of the page. You KNOW that given the circumstances, Delfen would help you to rebuild the book from his library, as soon as you get back to Daggerford. Still, it's a terrible shame. You would need to make a dc10+Spell Level INT (arcana) check each time you do it, or you'd lose the spell (destroying it and failing to cast). But in a pinch...