I'm confused. The point of sports drinks and gels is that you are burning carbs while you ride so you need to replenish them. Anything that is "carb free" fails to do that. So you run low on glycogen and you bonk.
You can get carbs from other sources, like pretzels, fruit, etc., if your stomach can tolerate them. (Unfortunately mine usually can't, especially during hot summer rides.) One benefit from sports drinks and gels over actual food is that the drinks/gels are formulated to be processed quickly by your digestive system so your body gets the benefits more quickly.
Another benefit from sports drinks and gels is electrolyte replacement. But electrolyte replacement alone won't be enough to get through a long ride, you still need the carbs.
FWIW, I know someone who makes his own sports drink. I don't know the full recipe but orange juice and salt are the two ingredients I remember him mentioning.



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