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What are the amounts (in mg) of Potassium & Magnesium in the 365 Electrolyte Enhanced water? I am an endurance athlete & need regular intake of electrolytes, but this water bottle doesn't give amounts. I do see that there is 0mg of Sodium, often a critical component of any electrolyte drink. Can you please give some details so I can determine if this is a good addition to my hydration plan?