Lowering pH of well water for citrus - not with vinegar?

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Blueberries and Battery Acid Adventures

I decided to try and grow container blueberries. I used the pine bark and peat moss mix. Then I did something stupid. I added well rotted composted manure to the mix. I bought one of those cheap Chinese ph soil probes and was disappointed when it never registered any PH level at all. I figured it was just broken. Weeks go by and the plants keep looking worse and worse. One day I decided to dip the PH probe into some vinegar and all of a sudden it was no longer broken. (it was never actually br…