JesmondJester I don’t want to be a Hoffman fan boy and I am happy to be led but struggle to wade (pun intended) through lots of information about what is “right” and his information is so accessible.
The answer may be as simple as buy a Brita and see what you think. Or that and BTW and compare. Or Zero Water and a few sachets and try them and see which you like best.
I don’t recall Hoffmann having any information about water.
You don’t need any sachets of anything with the Zero jug. See if you can get an alkalinity reading (in mg/L CaCO3) from your water supplier. You know the Zero jug water will be 0, so mix your water to get around 50g/L alkalinity.
So say your water is 150mg/L use 1 part tap to 2 parts Zero jug water, takes moments to mix in a kettle/jug on scales.
A KH/Alkalinity drop kit is handy, you could then check results with a BWT jug too.
Making coffee is more like cooking than an ology. Easier than a lot of cooking which commonly has more than 2 ingredients 😀