EP51. This Is The Stuff They Put In The Drinking Water!

Do you know how to put things together and make them another thing? Take peanut butter then add jam and bam PB&J. Add water to hops and repeat, the you have beer. What about the stuff you can't see? The stuff that they say is in there but you can't really see it. How much of what we know do we not know? Do we even really know what they use to purify our drinking water?