Electrolytes recommended by mast cell people. Read ingredients lists because you may want specific levels of specific electrolytes, and may want to avoid citric acid or other additives.
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Trioral - Oral Rehydration Salts - World Health Organization formula
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Elite Water - 240ml bottle without sugars, flavorings, or anything artificial
Flavored-only:
Generic:
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Distilled water with hand-picked electrolytes added. For example, the World Health Organization (WHO) Oral Rehydration Solution (ORS) recommendation is NaCl (salt) 2.6g/L + Trisodium citrate dihydrate 2.9g/L + KCl (NoSalt) 1.5g/L + anhydrous glucose 13.5g/L.
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Coconut water, unsweetened. Good for potassium.
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Plain watermelon juice.