Pickle juice is great. The best pickle juice I had was at a bar in a Vietnamese restaurant years ago, it was from daikon and carrots and was absolutely delicious, the whisky was crappy Jack D but the pickleback was divine and I ordered a few more of those.

In terms of creating a product, it is a cool notion but there are options on the market already. Though if you did a different pickle juice flavor beyond standard pickled cucumber flavors maybe some funkier flavors like described above that could be cool.