At the end of the day, the difference is subtle but real. Club soda has minerals that give it a tiny edge in taste and mixology. Seltzer is the honest, no-makeup version. Both are infinitely better than flat water in a hot car.
So next time you’re at the store, buy whichever one is on sale. Or pick the one with the prettier label. I promise, your taste buds will forgive you. Life’s too short to stress over bubbles—just make sure they’re cold. That’s the only rule that really matters.