I had heard of Gookinaid (Hydralyte) for a number of years but an ETS member's suggestion in a post finally got me to try it about a year (or two?) ago. Since then, I've become a huge fan of it. You rarely see it in retail stores, so ordering
online is probably your best best. Well, my local REI has it, but just one of the flavors. All the flavors are quite mild tasting, not salty, and I honestly believe that it hydrates better than any other electrolyte drink I have tried (or as well as anything more expensive). I have a pitcher of it in my fridge right now.
You might want to search the forum for terms like "electrolyte," "hydration," "ORS" and "hyponatremia," too. We've had some interesting discussions on the topic of hydration before. I think you'll pick up some useful additional info if you dig into the topic a bit more.
Too many of the so-called "sports drinks" you see in the store are just beverages. Drink them for the taste, but don't drink them because you think they make a good electrolyte drink. They usually have too much sodium and sugar for optimum absorption and not enough of the right kinds of electrolytes to do much good.