I'm trying to develop a recipe for homemade sport drink as Gaterade and the like contains unhealthy and/or unnecessary ingredients that I dislike. I found a base recipe I'd like to work with to variate and tweak: http://wellnessmama.com/2575/natural-sports-drink/ . Is there any obvious aspects in this recipe that need modification and/or can be improved? One particular question is if the tea liquid will be chemically reactive to the calcium tablets and be health-wise unviable? The goal is to make the drink all at home and let it be healthy and well suited for drinking during performing sports.