Answer:
Kills the bad ones and the sad ones. Tightens to fit, so one size fits.
It happens when something has been cut with H2O.
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.
What liquid can contain the soul?
What goes up but never comes down?
What never gets any wetter no matter how hard it rains?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?