 CHAR: In the bonus episode where Goku and Piccolo receive their  licenses, Chi Chi gets them to take drivers ed. by threatening to  not make them dinner anymore. Both Goku and Piccolo panic at the  threat and sign up for the course. Piccolo is from Namek and is made  known throughout the show that Namekians only need water to survive.  On King Kais planet, when offered food by King Kai, Piccolo  declined and continued to drink water. PICCOLO DOESNT EAT FOOD!