For years, I've regularly purchased hydration drinks to help me recover after doing something strenuous. It dawned on me that I could make this myself. After reading Wikipedia, I determine that the five most common electrolytes are salt, potassium, magnesium, calcium, and chloride. I checked various drinks and many seem to have the first three. So, I started making my own and it seems to work fine. My personal mix is water mixed with half a teaspoon of salt, a packet of Splenda, concentrated lime juice, and magnesium when I want to add it. For magnesium, I use the Natural Calm powder. I make about 24 oz at a time.