AHC: Improve sanitation in the High Middle Ages

Really the biggest challenge is boiling enough clean water for day to day hygiene
Handwashing? Needs clean water
Teeth brushing? Needs clean water
Bathing? Needs LOTS clean water. Even if you were to find a way to design a medieval-level shower you're still gonna need a lot of water.

Potential solution, though this would potentially be limited to places with warm climate or during summer-time

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Theres no way in hecc that the average peasant could afford something like this, but rich people like merchants, clergy, and lords could probably fund public drinking water fountains that distill massive amounts of water using the sun.
 
I think the easiest thing would be to set up simplistic aqueducts and flowing latrines.

We know water wheels were commonly a thing, so we could start normalising the construction of water wheels to raise fresh water to a simple wood/earth raised waterway, ideally covered, but eh - that travels into the heart of the village, and then back out again. Inwards, you've got fresh, relatively clean, water - and on the way out you have a self-emptying latrine.

Don't get me wrong, it seems like something better done in partnership with a mill, but if you're close enough to a river, it makes sense to do. The big problem is that it relies on much more construction and earthworks than I expect would be used otherwise.

The idea could just go to full on aqueducts like they'd have seen historically, which could see multiple villages fed and flushing on a single system. Heck, considering it is fundamentally a core piece of infrastructure, that'd need paths to allow maintenance, and it would connect to every village - you could well see it be tied to the castle of a local lord if that approach was to be taken.

The smaller systems are a bit of work, anything bigger would be MUCH larger. So I think you'd also have to figure out a way to have the whole program make money, which to me screams "irrigation".

But yeah, TL;DR - develop a combination of irrigation, freshwater, drainage and sewerage system using basic water wheels and controlled water flow.
 
Even today your tap water and most bottled water isn’t boiled, it’s filtered. Sand filtration of rain water and storage in a cistern is technologically doable in the Middle Ages, maybe even a bank filtration if near a river.
 
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