I use Liquid IV electrolyte packs and MtnOps caffeine packs in bottled water pretty often - mostly just water. I do occasionally drink an energy drink as a guilty pleasure before matches - I haven’t had a soda since 1996, and I’ve only had one cup of coffee in my life in 1994 - but a little “wake up” and a lot of sugar gives me a common cognitive sensory association trigger I can use while shooting. But by and large, just water, drinking electrolyte mix about every 3rd bottle on hot days.
I do try to drink a full bottle of water per stage during PRS matches.
I do try to drink a full bottle of water per stage during PRS matches.