You can buy dill pickle relish, but I really prefer the juice. We always put pickle juice in our tuna salad, along with celery salt, usually sweet pickle juice, but dill pickle juice is good, too.
I wonder whether pickle juice tastes s a Southern thing or a Tennessee thing?
I know lots of people do use it in various salads, but in my experience it’s always sweet. The dill relish is interesting, though - if I have ever seen it I would have assumed it was sweet; but it would be good in lots of things.