How much does a guinea pig eat every day?

a small bowl full of guinea pig/rabbit food and a handful of hay is good for their digestive system.

Do NOT give a guinea pig rabbit food. They need a cup of lettuce and a half a cup of fruits and veggies DAILY. They also need an unlimited supply of timothy hay, fresh water, and guinea pig pellets. Make sure the guinea pig pellets are plain with no dried fruit or anything in it. ( i use mazuri )