Answer:
It can be clear like water, but it burns like fire.
Sally's mom has 5 children, Boby, Jimmy, Franky, Marly. Who is the last child?
What goes trough your head but you forget it like 3 days after?
What starts with the letter T, is filled with T and ends in T?
I occur twice in eternity. And I'm always within sight.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?