Eli5 How did travelers/crusaders in medieval times get a clean and consistent source of water

Question

Eli5 How did travelers/crusaders in medieval times get a clean and consistent source of water

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Answer 1

I’d like to mention that you make soup by boiling water, and soup is kind of like water but tasty.

So having clean boiled soup can kind of count as clean water. They didn’t understand it very well perhaps, but it’s a thing.