Answer:
I am a lunch money thief
My first though water cures no thirst my next alone has soul and when he lives upon my first he then is called my whole.
What has 3 feet but no toes?
I am found on Mercury Venus Earth and Mars but not on Jupiter or Saturn. What am I?
I begin your sentences. What am I?
No matter how little or how much you use me, you change me every month.