My 2 cents,
Very beer I make I use a water profile EZ cala,or Beersmith water profile tools ,and start with RO or DI, the reason being the water that either the city makes, it is to hard more most beers anyway.
I found out by making many batches of beer that ,it is best
If you get Beer Captured Book it has all the water styles for the Beer Styles being brewed on page 177
Really easy to do you put the PPm and just enter the data and it gives you the amounts need in GRAMS
I do 10 gallons batches so I set up for a 13 gallon amounts that wat i always have enough strike water on hand to hit my mash target, after mash in I add the total amount of water volume to make my per boil volume
hope this helps
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