hydrated lime raises PH, you can get it at big chain "mart" type stores with garden sections, I usually boil it in to water (otherwise you'll have to shake it up and test it every time which works fine but...) I've had the same box of it for years and haven't used more than a few cups. But my water is ph 6.8, so if anything I usually need to lower PH (make acid)
high ph is alkaline, low is acidic. vinegar will lower ph (I use acetic acid instead very very sparringly BTW)