Sometimes I think the most overlooked fact about good coffee is good water, it also doesn’t have to be super complicated in my opinion, keep in mind a lot things on here are opinions that I’m quite sure someone will disagree with and that’s ok, maybe my opinions will help you form yours!
I have found that the easiest way to get good water at home is just a Reverse Osmosis that is producing 20-30 TDS water, if you have a good unit that is down in the single digits with TDS consider adding mineral, something as cheap and easy as 3rd Wave Water https://amzn.to/47HYwUk or if you want get technical try the APAX LAB BOX SET sold on the Next Level website
Also RO units don’t have to be complicated here is the one I have used and it was simple to install and easy to change filter and Membrane https://amzn.to/47RVo6Z If you can spend the money check out the next step up that has the TDS meter on Spigot https://amzn.to/3JA3GIP and of course there are many other options besides these, also you can add inline Remineralizer they sell https://amzn.to/3XuTg0c
