How to store extra, unused brine?
Brine can be stored in the fridge pretty much indefinitely. It might even be safe at room temp, but you'll want it to be cold when you use it anyway. If you used whole seasonings (which are, indeed, pretty pointless,) strain them out, especially if you plan to store your brine for more than a week.

I have kept a half-gallon jar full of brine in the fridge on weeks when I want to use it for several small items over a week or two. Brine-making never seems worth it for a pork chop, but my pork chops definitely benefit from a 24-hour brine soak, so it can be worthwhile to have some on hand.