It's best to eat bland food---baked potato or oatmeal. The one food NOT to eat is CORN---You won't be able to tell which are stones or corn kernels. Ha
It never seemed to matter to me. But I eat "well", anyway. In fact, I've even done "the ice cream flush" and ate premium ice cream two hours before taking the potion. (You can also eat whipped cream and berries. I have cherry vanilla Haagen Daz.)