Hey guys! I've been brewing for just about two years but have been doing BIAB. I finally purchased the equipment to go full all-grain and fly sparge. When I brewed BIAB I had added my minerals to the entire volume of water to get the proper pH. What I'm confused with is how many minerals to add...

I have tested my water source for total hardness (soft), but how do I get the specific measurements of individual minerals needed for an accurate water profile? I'm not using municipal water so I can't get a gov't report... I need some way to test my specific water - short of paying a mint for...