As mentioned this is a huge topic. While most brewers (or homebrewers at least) seem to not worry about it much, some do exactly what you're describing to build water with a desired mineral content for each beer they make. Adding sodium chloride, calcium sulfate, magnesium sulfate, and other salts to reverse osmosis water allows brewers to build exactly the water profile they want.
In many cases, though, brewers are looking for ion concentrations that will aid with mashing and fermentation as well as augment the final flavor of the beer, often trying to match historical water profiles. For your purposes you may want something different; it's hard to say. However, with some research you should be able determine what water profile you want and what amounts of which salts will get you there. You can buy the necessary salts at a local homebrew shop and while there you may also be able get tips on how to go about the process.