I use Clif Shot Bloks. They are "gummies" that don't melt...they're 95% organic...and they come in several flavors, each having it's own "special use". Margarita flavor for instance has 3x sodium to help prevent cramping. I personally use the Mountain Berry Shot Bloks, as they have no additional additives. When they get delivered to my house they sit on the front step, in the sun, until I realize that they've been delivered. That's usually a few hours. And they never melt. They also feel sticky but dont leave a sticky residue on your fingers. Each pack comes with 2 servings (6 bloks), and boxes of 26 packs run $26-$44. I get mine at runoutlet.com as they're about $26 per box and that includes free 1-2 day shipping.