Mountain streams are deadly. Mountains..... are made of dirt. We don't want to drink dirt. (yes mountain dirt is better than city-water). We get minerals from food. Water should be pure H2O, nothing added.... (zero inorganic mountain minerals; body cannot use em, they're like sand in the gas tank -deadly). Distiller should be No.1 Priority, and only £100ish, maybe £200 for a Megahome (best one)

P.S. - What if there was literally an elephant in the room.. ?