I don't keep them mixed together, but what I use is powdered magnesium citrate(not because it's the best, but because it's cheap and for this purpose, effective), potassium chlorite, and MSM(very bitter, so sometimes I just chase a teaspoon with juice) and just some table salt. Take some country time lemonade powder and make some home-made sports drink.
All the other stuff people use in these drinks are very common in diets. It's really the potassium and magnesium for me that helps. So really, if you're just making sports drinks to save a buck just because those are your go to drinks, then do whatever. But if you realize you're missing specific nutrition in your diet, thus making your own drink. I highly recommend you look over the macros on your existing diet, crunch those numbers and see what is going to be the most effective.