Don't boil the same water more than once.

This is common in the West [1], I do it, probably picked up from the Chinese around tea. I've also seen ice nerds talking about it in a positive way.

My conspiracy is when you have dirty water any memes that encourage boiling more water will proliferate. (Since you'll drink the old boiled water over collecting more from a stream)

[1] https://trove.nla.gov.au/newspaper/article/23144234?searchTe...