Mix all dry ingredients. Add lemon juice and water. Chill and serve.

One final note: Electrolyte imbalance is serious. I will not be giving this to my husband the day of or the day before his next marathon. I’d much rather spend a few dollars buying him a professionally made drink that I know will provide him with exactly the kind of electrolytes he needs instead of accidentally making a mistake with my measurements and sending him to the hospital. I WILL be sending this with him to work when he’s outside on hot days or when he’s training and having his shorter runs.