Solve dis riddle.
i am a word of five letters!
people eat me!
if u remove my 1 letter i will be a form of energy!
if u remove my first 2 letters i will be needed 4 living.
if u remove my first 3 letters i will be a preposition
if u remove my first 4 letters i will be a drink 4 u.
answer if u r mastermind!