Does water matter? A small blind test
I kept reading that water makes or breaks coffee, so I tested it the lazy way: three jars, same beans and ratio, different water. Tap water from my kitchen, the same tap water through a jug filter, and a cheap bottled spring water.
I did not trust myself to taste blind, so my partner and two friends tasted while I poured. They had to rank the three glasses and say anything they noticed.
All three picked the filtered water as their favourite. Two of them called the tap water version "flat" and "a bit chalky". The bottled water came second for everyone, which surprised me, since it was the most expensive option.
What I take from it
My tap water is fairly hard, so this may not apply everywhere. But a jug filter costs little and clearly made a difference here. I have not tried mineral recipes or distilled water with added minerals yet. That is probably the next rabbit hole.