I know the best bowls to use are the stainless. But Hercules will not drink out of the stainless b/c he can see his reflection and it scares him. He will eat out of it until the food is almost gone and he can see himself then he stops. Is ceramic bowls OK? I know plastic is a no-no b/c of bacteria. I'm going to keep trying the stainless. He's normally fearless, maybe he's going through a scaredy cat faze.