Our water comes into the house softened so I have no choice. I have a Brita filter but still, depending on the style I'm brewing buy RO water from Walmart or Copps for 0.37 a gallon and dilute 1:1 up to 3:1.
Then add calcium sulphate or calcium chloride or both for IPAs along with sour malt for PH. Read the Primer on this forum. Pretty good and makes sense.
Grinders Island Brewery - Pipeline
Bottled! Award winning East India Porter, Oatmeal Stout, Milk Stout, Saison fermenting at a nice controlled 85 degrees (up from 70) as it should be - weird isn't it.