Nuun is an eight-year-old company that's well known in the world of endurance sports but is also popular among PGA Tour pros like Davis Love III, Paul Casey, and others. Nuun's sugar-free tablets dissolve in water in less than two minutes and provide golfers with the proper fluid balance of water plus electrolytes like sodium and potassium. The tablets come in a variety of flavors, from the basic (lemon-lime) to the exotic (kona cola). Nuun's taste is light and pleasant, with its mild sweetness supplied by stevia, a natural additive that's extremely popular around the world but has a byzantine history with the FDA. (It may be worth Googling, if one is concerned.) The bottom line for now is that the stuff tastes good, and it has to be better than the 15th hole crash golfers experience when the jolt from that sugary sports drink wears off.
$24/pack of four (each pack contains 12 tablets); nuun.com