Answer:
What has a head and a tail, but no body or legs?
I have a small hill with seven holes.
I am a food with 5 letters. If you remove the first letter I am a form of energy. Remove two and I'm needed to live. Scramble the last 3 and you can drink me down.
Some try to hide, some try to cheat, but time will show we always will meet.
In my life I must bare, my bloodline I must share. What am I?
No matter how little or how much you use me, you change me every month.