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How to make oral rehydration solution (ORS)

Oral rehydration solution (250 ml):Sodium chloride - 0.65g; Potassium chloride - 0.375g; Trisodium citrate - 0.72g; Glucose - 3.375g Everyday health skills 1 min read
Not yet medically reviewed. This page has not been checked by a qualified medical reviewer. Use it for general education only and confirm anything important with a healthcare professional. Last updated 26 October 2026.
These tutorials are for general education. Follow the instructions that come with any device or product, and ask a health professional if you are unsure whether something is safe for you.

Prepare a drink that replaces fluid and salts lost through diarrhoea or vomiting.

What this helps you do

Oral rehydration solution prevents and treats dehydration from diarrhoea. The right balance of sugar and salt helps the gut absorb water.

Safety: before you start

Use sachets whenever you can, mixed exactly as the packet says. Too much salt can be harmful, so measure carefully and never add extra.

What you will need

  • Ready-made ORS sachets if available (best option)
  • Or: 1 litre of clean, safe drinking water, 6 level teaspoons of sugar and half a level teaspoon of salt
  • A clean jug and a measuring teaspoon

Step by step

  1. Wash your hands with soap.
  2. Pour 1 litre of clean water into a clean jug (boil and cool it first if unsure it is safe).
  3. Add 6 level teaspoons of sugar and half a level teaspoon of salt.
  4. Stir until dissolved.
  5. Give small, frequent sips, using a spoon for young children.
  6. Make a fresh batch every 24 hours.

Tips and common mistakes

Keep breastfeeding babies and continue normal food once vomiting settles. If someone vomits, wait 10 minutes and then give smaller sips more slowly.

When to stop and get help

Get urgent help for a baby or person who is very drowsy, has not passed urine for 8 hours, has blood in their stool, keeps vomiting everything or has a sunken soft spot (babies).

For students & clinicians (technical detail)

How and why it works

Glucose and sodium are absorbed together in the small intestine, and water follows them. This works even when diarrhoea is severe, which is why ORS saves many lives.

Image credits

  • Heading image: Sachinthonakkara, Wikimedia Commons, CC0