Yes, water quality matters a lot in coffee enthusiast land. They actually make little mineral packets that you add to a gallon of distilled water to get a "perfect" brewing water - I know since I actually use them for my espresso machine to fight scale buildup from my +10 grain tap water.
Note this excessiveness is really needed for espresso though; a regular Brita jug handles more tolerant methods of brewing perfectly well (and to be honest most people murder coffee enough that the water is the least of their concerns)
Just a suggestion as well, theres countless 'water recipes' that let you easily do the same thing for a fraction the price. They arent doing anything complicated. Some mixes are simple two ingredients, some go up to several, but all are pretty dead simple.
Lets you fiddle and fine tune things more for your own preferences too.
Note this excessiveness is really needed for espresso though; a regular Brita jug handles more tolerant methods of brewing perfectly well (and to be honest most people murder coffee enough that the water is the least of their concerns)