In a way, I am a foodie. I NEED food every 2-3 hours. But I eat small and eat good. While on my trip, or for that matter any trip overseas, I easily and happily survive on fresh fruits and veg subway. I really do not need to go to expensive restaurants.
Fresh fruits, like watermelon, musk melon, cherries were delicious in Spain. I would buy them from local shops and eat them.