The meals of Chol Hamoed:
How many meals is one to have per day? One is not obligated to eat any specific amount of meals on Chol Hamoed, so long as he does not fast. [Nevertheless, initially it is a Mitzvah for one to have a meal with bread. One is to eat bread twice on Chol Hamoed, once by day and once by night.]
Eating before midday: One may not fast past midday on Chol Hamoed. One must thus eat or drink something prior to midday.
Bread: One is not obligated to eat specifically bread on Chol Hamoed, and it suffices even if he eats mere fruits. Nevertheless, initially it is a Mitzvah for one to have a meal with bread on Chol Hamoed, [once by day and once by night, as stated above].