What Am I ??

#25

I am a word of 5 letters..

If you remove my 1st letter, I will be a form of energy..
If you remove my 1st 2 letters, I will be needed for living..
If you remove my 1st 3 letters, I will be a preposition..
If you remove my 1st 4 letters, I will be a drink for you...

  Difficulty Level - 2/5

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  Solution : 

  There are 3 possible answers namely Cheat, Wheat and Sheat.