The book is yellow and its title is written in blue font. A Krabby Patty is on both the front and back covers. The Krabby Patty on the front separates the word 'recipe' from the rest of the title.
Role in episode
In order to steal the Krabby Patty secret formula, Plankton hires and receives help from his entire family tree filled with his cousins. Unlike other attempts, this time he is able to find and steal the book while the Krusty Crew and Mr. Krabs are caught off guard. Mr. Krabs warns him of an ingredient that will haunt Plankton forever. Plankton ignores the warning, and he and his cousins find out that the top-secret ingredient is none other than ground plankton. Plankton and his gang run out of the Krusty Krab, screaming in fear and surprise.
Squidward asks Mr. Krabs if plankton is actually the secret ingredient. Mr. Krabs replies with a no, explaining that this decoy was only to prevent Plankton from trying to steal the real formula for some time.
It's impossible to put a book into a bottle.
Plankton takes the book from the bottle, by his hand, and he didn't break the bottle. If one goes frame by frame, they can see how the book is getting smaller when it's about to come out.