Last year I was concerned that the only electrolyte replacement available at a local century ride was Gatorade. For me Gatorade has too much sugar and too much salt, it bothers my stomach. As it turned out the Hammer nutrition rep had a booth at the bike expo. She gave me a couple of handfuls of individually wrapped Fizz tablets. These worked great. I avoided cramping and unlike other replacements I have tried they don't taste like sweat and don't need to be chilled to be drinkable. The packaging is convenient too. I prefer LemonLime and Mango to Grapefruit. I think they are a little expensive and you need to be careful the first time you open the bottle because the effervescence can cause the liquid to squirt out. These are the best I have tried.
