Water Profiles

So I am getting more and more into tweaking my water. My plan is to start building it from DI/ RO water depending on the style of beer.

While I can handle it, I am no chemist. Considering all DI/RO water is essentially the same, shouldn't there be SOME sort of calculator out there that takes in account what you are brewing and how much and then tell you exactly what minerals and salts that need to be added?

Am I over-simplifying it?

You should post this on the Brew Science thread.
1st, you should read " A Brewing Water Chemistry Primer" then take it from there

Here ya go...

https://www.homebrewtalk.com/f128/brun-water-v-1-12-posted-325949/