re: If an IV bag is just water, why am I paying so much for it?

1) why are you letting a "med school dropout" put a needle in your arm?

2) if you filled a "big" with water and pricked yourself, most of the red blood cells in your body would burst within minutes, causing you an extreme burning sensation throughout your body before your heart started deteriorating into a deadly rhythm and you died.

Maybe stick with the professionals on that one, chief.