title_body: How does distilled water or water filtered by reverse osmosis affect the taste of coffee?
upvoted_answer: I've heard that the mineral content in water assists in the distribution of the particulate that's extracted when brewing coffee. While I've not used distilled water, I have used reverse osmosis water (I live in an area with very hard water). I tend to prefer using the reverse osmosis water to the tap water. I don't particularly care for the taste of distilled water on its own, which is why I have avoided using it in coffee.