The formula of homemade oral rehydration salts (ORS) should refer to the standards of the World Health Organization (WHO) to prevent or correct mild dehydration (such as after diarrhea or vomiting). The following are the safe and effective ratios and precautions： ###**Standard formula** (recommended by WHO)： -**Pure water**: 1 liter (cool after boiling to ensure hygiene) -**Table salt (sodium chloride)**: 2.6g (about half a teaspoon, need to be accurately measured) -**White sugar (or iodine-free sucrose)**: 13.5g (about 3 teaspoons) -**Optional**: If conditions permit, a small amount of potassium chloride (1.5g) and sodium citrate (2.9g) can be added to be closer to the standard ORS, but not necessary. ###**Simple Home Edition** (if there is no precise scale)： -**Water**: 500ml (about 2 cups) -**Salt**: 1.3g (1/4 teaspoon, **Do not overdo it**) -**Sugar**: 6-7 grams (1.5 teaspoons) ###**Key precautions**： 1. **Accurate measurement**: Excessive salt may lead to hypernatremia, which is harmful to health. 2. **Hygiene and safety**: Use boiled water and the container needs to be clean. 3. **Applicable conditions**: Only for mild dehydration. If you have severe diarrhea, vomiting, confusion, reduced urine volume, etc., you need to seek medical attention immediately. 4. **Contraindications**: Patients with diabetes should use sugar with caution, and consult a doctor to adjust the formula. ###**Supplementary suggestions**： -You can add a small amount of orange juice or bananas to supplement potassium (if there is no potassium chloride). -Use up within 24 hours after each preparation to avoid pollution. If you have any questions or symptoms worsen, please seek professional medical help in time. Homemade rehydration salts are not a substitute for intravenous rehydration treatment in severe dehydration.