Eu acredito que isso é "Wild Child" .
Aqui está a sinopse:
Briana Fox is the wildest girl in school. She and Kyle have been close for a long time...almost lovers. But Kyle is afraid that if he pushes her, he'll have his heart broken and lose his best friend. When Briana challenges him to a swim across the lake, she's injured in a horrific accident, but she discovers a mysterious substance in an underwater cave that saves her life. What seems to be a magical yet harmless "power drug" invokes superhuman abilities, and Briana soon becomes dependent on it for her very survival. When two government agents learn of the discovery, they will stop at nothing to find the source and turn Briana into a human experiment. Is Kyle willing to risk everything to protect his love?
As resenhas do livro enfatizam que o líquido é verde e brilhante, o que a sinopse deixa de fora.