[T.B. Yoits]

Did you forget the /s? I’d say people have been adding pickle juice since the first ever batch of potato salad.

Only the smart ones. I hadn't heard about it until recently.

[bgill]

In the days before refrigeration, they used vinegar or pickle juice to help preserve it. Mayo wasn’t used.

[bgill]

Never throw out pickle juice.

Use it to make pickles from fresh cucumbers and other veggies.
Add a cup to the crock pot when doing a pork roast. Use it to brine meats.
Use it as a vinegar substitute when cleaning sink drains.
Pour it over shaved ice or drink it.
Add it to sauces and dressings.