how did/do native peoples find safe drinking water? Is water boiled? Or have they built up immunities to funky junk in the water?
In: Biology
Chiming in from Finland: springs and certain mountain streams are reliably enough clean that drinking straight out of them is safe to this day. Agricultural runoff from modern day farms is a major factor in making certain rivers unpotable. Even some lakes are safe to drink from, at least for people with relatively robust immune systems.
And as late as my own parent’s childhood years, a considerble proportion of people literally had wells on their yards, another example of natural water being safe when crucial requirements are met.
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