Answer:
You eat something you neither plant nor plow. It is the son of water, but if water touches it, it dies.
At night I come without being fetched. By day I am lost without being stolen.
I am a box that holds keys without locks, yet they can unlock your soul.
What dress does everyone have, but no one wears?
I can be moved. I can be rolled. But nothing will I hold. I'm red and I'm blue, and I can be other colors too. Having no head, though similar in shape. I have no eyes - yet move all over the place.
You use it between your head and your toes, the more it works the thinner it grows.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?