How to fix the cover of a book that is wet?

Okay so I purchased the How To Train Your Dragon book series by Cressida Cowell and I took one of them to a friends house. The next morning I wake up and see that the book cover is wet and ripping from the pages. I started to cry because it was my favorite book and my friends kittens spilled something on them! So I went on YouTube to see how to fix it but they're not going to work. The spine in soaked and bits of it are peeling off so I can't glue it down. I'm at the point where I'm going to purchase a new book for $8.00 from the same place I got them; Barnes and Noble. Does anyone have any helpful suggestions as to what I can do to fix the cover?

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