IDK, it just doesn't seem worth it. Caustic chemicals, inexperience.... not to mention you're going to need a PH meter to measure what you're mixing in the first place and if you can afford that...
which brings me to my next point, if your soil or water tends to go in one direction, then you only need one bottle of solution ($12) but you will be adding salts to your soil with any ph solution, exacerbating your PH problems later on. It's better to buffer your soil before rather than add PH solutions later. In your situation OP, I'd flush with several gallons of distilled water per plant rather than mix my own solution and guess the PH.
Milwaukee makes some decent $25 ph meters, just as (in)accurate as a $125 Hanna. (I've used both) Then you have to add calibration/storage solution ($20 qt) and your PH solutions ($25 for both). I no longer use my PH solutions, by the time I bought all this crap I figured out how to maintain my PH without it, lol.
Good luck man!!!