So tap water is sewage with the shit rinsed out, huh?

Well, spring water is rain that has has picked up sheepshitcowshithorseshitbirdshitmoleshitwormshitpotholerpissantshitrottingvegetationshitairpollution which has been rinsed out (OK if we say "filtered?"). You only have to worry if you're one of those homeopathy fans who believe that water with nothing in it has something in it.