Fix My Coffee
Does water affect coffee?
It does. The cup is almost entirely water, and the minerals in it take part in extraction. Hard water dulls the flavour; water with no minerals leaves the cup hollow.
What the water is doing
Minerals pull the aromatic compounds out of the coffee. Distilled or heavily purified water cannot do that job: even a well-made brew comes out flat and empty.
Hard water is a different problem
High-limescale water flattens the cup: it suppresses the acids and the coffee tastes duller than it is. The same water leaves scale inside your kettle.
What actually helps
A jug-style carbon filter removes the chlorine smell and makes a difference in most kitchens. If you buy bottled water, pick one with a low-to-moderate mineral content on the label, not the most mineral-rich one on the shelf.
Changed your water? Dial in again
The same grind gives a different cup on different water. Expect to look for your setting again the day you switch. That is not a mistake — it is proof the water was a variable all along.
Fix My Coffee logs every brew, so you can look back and see exactly when things started changing.