This article was first published over a month ago, but Andy just added the section on potable water as a result of this Hacker News comments conversation from

This article was first published over a month ago, but Andy just added the section on potable water as a result of this Hacker News comments conversation from a couple of days ago: https://news.ycombinator.com/item?id=45926469#45926914 https://news.ycombinator.com/item?id=45926469#45926914