Answer:
I am a five letter word. If you remove my first letter I am a form of energy. Remove my first two and I am needed to live. Scramble the last three and you can drink me. What am I?
I have a mouth on my head and eat everything.
I am flora, not fauna. I am foliage, not trees. I am shrubbery, not grass. What am I?
The more you take away from me the bigger I shall get.
I am owned by every man, though my length differs. Their wives use me after getting married. What am I?
Give it food and it will live, give it water and it will die.