Jake Maddox 
Shipwreck! [PDF ebook] 

When their whale-watching trip goes horribly wrong, Skylar, Gabby, and Miles find themselves on an inflatable raft in the middle of the ocean. With no food, a small amount of water, and only a small first-aid kit to help them, they must spend three treacherous days on the waves, hoping desperately for help to arrive. Sharks circle, their water supply dwindles, and Gabby begins to hallucinate. Will they survive, or are they lost at sea forever?