Dude just get some fucking Ph up and down from the hydro store. Dont be a cheap ass and introduce more shit than necessary to your system. Ph up and Down come from ingredients that are already in fertilizers. Ph up will add phosphorous and ph down will add potassium. Just stick with the stuff made for hydroponics and leave the vinegar in the kitchen for cooking.
It's not that it's that bad, it's just god awful expensive and wimpy. pH down is far more effective and a fraction of the price.