I was having a discussion with a friend about working in the heat. He mentioned that he buys an electrolyte powder from the health store, no flavorings, just the essentials. He didn't remember the brand name. I tried to find it but did not. Instead, I started looking for homemade sports drinks. Since I dislike carrying the powder because of the sugar (weight, bottle funk), I was interested in simulating the composition w/o sugar. The following link gives the composition of Gatorade, along with several homemade recipes for sports drinks:
http://www.cptips.com/hmdesnk.htm [about half-way down page]
What I thought was most interesting was that the sodium and potassium equivalents to Gatorade were achieved by simply adding 1/4 tsp each of Morton's regular and lite salt per liter.
Most hikers likely achieve the salt, but maybe not the potassium.