Propel is "fitness water" from Gatorade. It's like Gatorade, with all the electrolytes, but without all the sugar. It still has some sucrose, because sucrose helps you absorb water. It's got sucralose (a.k.a. Splenda) as well. It's non-nasty. I am planning a road trip on my bike next week, and this seems like it would be a pretty good thing to have on hand. If some marketing bigwig over at Gatorade wants to ship me a case, or a great big pile of money, please contact me.