Space Taxi: Water Planet Rescue by Wendy Mass
Archie Morningstar's dad drives a taxi through outer space! And with the help of a talking cat named Pockets, Archie and his dad help fight crime across the universe.
In the second book in this series, Archie, his dad, and Pockets fly to a planet in peril: someone is stealing the water from this underwater world! Can Archie and Pockets save the day?