Two results from today.
My partner's back was cramping during doubles... he took a swig of the pickle juice and the cramps disappeared. He's familiar with pickle juice and told me he usually takes a tablespoon of mustard for cramps (once again the vinegar seems to be the magic bullet).
After a few hours today of pretty strenuous doubles, my hand started cramping so I took a large swig and bingo... cramps disappeared
I also took a swig when I arrived home to prevent after-exercise cramps... which I also often experience.
Pretty cool stuff. Hope it continues working.