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Sodium: Sodium bicarbonate is a great choice, just normal baking soda. I take 5g while water fasting
Potassium: Potassium citrate powder is a great choice. I take 5g while water fasting. I recommend this one: https://www.amazon.com/Now-Foods-Potassium-Citrate-Powder/dp/B075JLK8YK
Magnesium: Magnesium citrate powder is a great choice. I take 500mg while water fasting. I recommend the same brand as above:
https://www.amazon.com/NOW-Supplements-Magnesium-Citrate-8-Ounce/dp/B004189JCW/ref=sr_1_5
I use these along with a host of other supplements.
Spartan Race Hydration Tablets - Electrolyte Replacement for Rapid & Sustained Rehydration | Clean + Simple Ingredients | Keto, Vegan, Gluten Free | No Sugar or Artificial Sweeteners (90 Pack) https://a.co/d/7Tz6L1w