I can't imagine V-8 on a nice 98* degree, 90% humidity day

Cool and not cold water sounds good in that case with some kind of electrolyte replacement drink in a second bottle. You might have to find one that suits your needs. I cut some of them, like Gatorade G2 stuff, a little cuz they are to sweet for my liking when I ride. Other than that a nice flask of your favorite post ride bourbon in your jersey always works regardless of temperature after a hard fast ride when you get off the saddle gaspoing for air and have that powerful thirst

I'm just kidding of course!