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We don't do juice, at all. However, I do brew herbal tea (Celestial Seasonings. Totally safe and caffeine free.) and keep it in the fridge. When he wants something other then water, I put that in his cup.
I would stay away from the Gatorade. It's REALLY bad. Here's a bit of info.
http://www.foodfacts.com/NutritionFacts/Gatorade/Gatorade...