One thing to know if you're a coffee snob is which cafes near you have an RO filter. The ones that do make much better espresso. https://www.goodreads.com/book/

One thing to know if you're a coffee snob is which cafes near you have an RO filter. The ones that do make much better espresso. https://www.goodreads.com/book/show/29427961-water-for-coffee https://www.goodreads.com/book/show/29427961-water-for-coffe... is the definitive guide apparently.