Vinegar smells like shit, just go to the hardware store/wal mart/target/lowes/home depot and get some spa chemicals called PH up and PH down, same shit they sell in the hydro store, a 2 years supply only run you 5 bucks.
Don't use just regular white vinegar. Use Apple Cider Vinegar. It's organic and a little goes a long way. I'm talking only a drop or 2 per gallon of water. Get a good pH tester before adding anything to your water.
if you stick with the good stuff, it is more guranteed to have the most correct effects needed, it is really not that much especially considering what these plants are worth to very many people especially us patients. I use genral hydroponics liquid test kit and ph up and ph down.