If you don't mind paying for it and lugging it or shelling out for a system that produces it, RO is clearly the simplest and easiest way to go. You can, at first, add a couple of salts (see the Primer here) and be on the way to better beer. Or you can get as elaborate as you want by using the spreadsheets to determine salt additions to emulate a particular profile (and they furnish several profiles to choose from).
As AJ says, RO is a very good option. But, be careful with spreadsheets. If your water already has elevated levels of some ions, its easy to overdose the brewing water with excessive ion content. The best solution is DILUTION, but be sure to choose a spreadsheet that guides and warns you when you're adding too much to your brewing water.
__________________
Martin Brungard, P.E. D.WRE
Carmel, IN
BJCP National
Foam Blowers of Indiana (FBI)
Brewing Water Information at: https://sites.google.com/site/brunwater/
Hate to admit it but I don't know that much about water. RO is just distilled water, right? The stuff you can buy anywhere? It's not de-ionized water I'm sure.
So what about a system? I'll pay to install one if it's worth it and I can find out what I need to look into to do it right.
Or dilution? That almost sounds too complicated to get the dilution % just right but I really don't know anything about that either.
Linear Mode
