I need ans

I am a word of five letters! People eat me! If you remove my first letter I will be a form of energy! If you remove my first 2 letters I will be needed 4 living. If you remove my first 3 letters I will be a preposition If you remove my first 4 letters I will be a drink for you. Answer, if you are a mastermind! Ans:_______

two, three and four - preferable over 2 ,3 and 4. The first person pronoun 'I' is always capitalized.

[ Edited with corrections in red by a moderator ]