Damn, too bad it’s not their Cranberry vodka!
Grapefruit is one of my favorite flavors, next to cranberry, and if you want to do a pitcher type drink, an easy thing might be a grapefruit Screwdriver (a nice OJ, or even with blood orange juice and the grapefruit vodka).
Jumping off the Screwdriver base, it would definitely support a hefty amount or even just a splash of cranberry juice (if you want intensity without dilution of added sweetness, I recommend Knudsen Just Cranberry for highly concentrated flavor), and plain or burnished fresh rosemary sprigs, a squeeze of lime and a wedge of lime, or orange, ahh, it’s endless! You could give it a fizz with soda water or flavored Italian soda, anything that slides into the profile, make it more holiday with a cinnamon stick, or stronger and more complex with botanicals of some gin, yadda yadda, I’m not helping! Too many options, I’m getting envious of your quandary.
A Grayhound, just also use the grapefruit vodka, similarly with Salty Dogs. I’d go so far to recommended Tanqueray Rangpur Lime Gin, for that added citrus with the botanicals, but I’m big on flavor, and that’ll get expensive pretty quickly in quantity. Fresh lime juice goes a long way.
You could also just get a bunch of cheap regular and diet tonic, (for options) and make up pitchers or pretty carafes of V & Ts. It’s nice enough flavor wise on it’s own, but great with all the above flavor options, too!
Regardless, you probably can’t go wrong with Deep Eddy, and a singular something tasty to mix.
Probably not exactly matching your meaning, but in a round about way, Dune, post Machine Crusade –
It’s maybe not as evident without reading the series–which definitely isn’t a negative comment! I’ve enjoyed (almost) every bit of the truly shocking amount of Dune I’ve put myself through since the very early '90s, haha.
I’m, uh, mildly obsessive as well as critical of the SF I stand by, (just for myself personally!–everyone should like whatever they like!) but Frank Herbert, entirely, still remains in my top 2 favorite authors. You may enjoy all the books as a whole, if you’re looking for something less about ‘the machine’ itself, but how humans diverge from it and without it, but it’s…a lot, lol. And…well, I won’t spoil things. I just remembered it might negate my entire point. Oh, no. (ʘ‿ʘ)
Anyway! Regardless!
If you do ever get into full-ass Dune–and I’d recommend this “tip” to literally anyone–I’d definitely suggest audio books for the early works of Brian Herbert and Kevin J Anderson. They took a bit to get into their groove from informational to actually entertaining. The lore is honestly fantastic, beautifully done, but physically reading their earlier Dune stuff can be textbook without diagram tedious. Love 'em both for the work, but shiiiiiiiiite.