Answer:
Big as a saucepan, deep as a cup, Even a river can't fill it up. What is it
What falls down but is never injured?
I start in little but I end in full, you'll find me in half and complete.
Many foods can make me strong but give me water and I won't last long.
What you do to determine the length of something
you hold my tail while I fish for you
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?