Salt and Sugar Solution: Does the DIY Rehydration Drink Actually Work?

A salt and sugar solution is the oldest rehydration trick there is, and most South African runners have been told to reach for one after a hot, sweaty long run or a rough stomach day. But does mixing salt and sugar into water actually rehydrate you better than plain water, and is the kitchen version good enough for a 30km Saturday run in Highveld heat? Here's what this simple drink really does inside your body, the exact ratio the health authorities use, when it works brilliantly, and the one situation where a runner should reach for something more precise instead.

What Is a Salt and Sugar Solution and How Does It Work?

A salt and sugar solution is water with a small, measured amount of table salt and sugar dissolved in it, and it rehydrates you faster than plain water because the sugar actively pulls the salt and water across your gut wall. That last part is the whole point. Your small intestine has a tiny molecular pump that only moves sodium when glucose is sitting right next to it. Feed it both at once and it drags water along for the ride, straight into your bloodstream. Published research on oral rehydration shows this glucose-driven absorption is exactly why the right amount of sugar makes the solution work.

Plain water doesn't trigger that pump, so it absorbs more slowly and you lose a good chunk of it to your bladder before it ever reaches your working muscles. Add the right pinch of salt and spoon of sugar, and the same water moves in faster and stays longer. This is the science behind every oral rehydration solution sold in a pharmacy. The kitchen mix is simply the homemade approximation of it.

How Do You Make a Salt and Sugar Solution at Home?

To make a salt and sugar solution at home, dissolve six level teaspoons of sugar and half a level teaspoon of salt into one litre of clean, cooled water. That ratio matters more than people think. The City of Cape Town oral rehydration guidelines set out almost exactly this recipe, and it lines up with the World Health Organisation formula that has been used worldwide for decades.

A few practical rules keep it safe and effective. Use clean water that's been boiled and cooled if you're at all unsure of the source. Measure properly, because too much salt makes the drink work against you and tastes awful. Stir until everything dissolves. A squeeze of orange or a little fruit juice makes it far easier to get down, which matters when you're nauseous or wrung out after a long effort. Mix a fresh batch each day and throw away what you don't finish.

What Are the Benefits of a Salt and Sugar Solution for Runners?

The main benefit of a salt and sugar solution for a runner is faster fluid replacement after heavy sweating, which helps you recover quicker and sidestep the headache, dizziness and flatness that follow a dehydrated long run. South African conditions make this more relevant than most runners realise. A summer long run in Pretoria or a midday training block in Durban humidity can cost you well over a litre of sweat an hour, and that sweat carries sodium out with it.

Replacing only the water and not the sodium is a common mistake. It leaves you feeling washed out even after you've drunk plenty, because your body can't hold onto fluid without enough salt to balance it. A properly mixed batch fixes both at once. For everyday hydration around training, a simple homemade drink genuinely does the job, and our guide to ORS for runners goes deeper on when to use it through a race build.

When Should Runners Use a Salt and Sugar Solution?

Runners should use a salt and sugar solution after long or hot sessions over about 90 minutes, on heavy-sweat days, and any time a stomach bug has left them dried out. For a short easy 5km in cool weather you don't need one. Plain water and a normal meal will cover you. The solution earns its place when sweat losses are large or when illness has stripped your fluids faster than you can replace them.

If a tummy bug hits the week before a big race like Comrades or Two Oceans, this drink is the first thing to reach for, sipped slowly through the day. It's also a sensible thing to teach the whole family, since the same mix helps an active teenager who's overcooked it at school sports or a child recovering from a runny tummy. This is exactly the kind of simple, real-food-first fix the Run Baby Run founders built the store around, after their own kids started fainting at school from poor fuelling and hydration.

Salt and Sugar Solution vs a Shop-Bought ORS: Which Is Better?

A homemade salt and sugar solution is fine for everyday rehydration, but a shop-bought oral rehydration solution wins when precision matters, because the ratios are exact and you remove the risk of mismeasuring. The kitchen mix depends entirely on you levelling those teaspoons correctly. Get the salt wrong and you can make yourself feel worse, especially when you're already nauseous and not thinking clearly.

A formulated option like DripDrop ORS takes that guesswork away. It replenishes you faster than a standard sports drink because of its precise electrolyte-to-glucose ratio, with about half the sugar of a typical sports drink, and each sachet works out to around R22 a serving. For a hard race day, when fuelling and hydration genuinely make or break your result, that reliability is worth it. Many runners keep a box of these doctor-developed sachets in the kit bag for race week and use the homemade salt and sugar solution for ordinary training days. If you'd rather have a tablet you drop into your bottle, the 32Gi Hydrate effervescent tabs are another precise, lower-effort option, and you can compare the full range in our honest electrolyte drinks guide.

Are There Any Risks With a Salt and Sugar Solution?

The main risk with a homemade rehydration drink is using too much salt, which can push your sodium too high and leave you feeling worse rather than better. Stick to the half-teaspoon-per-litre measure and you stay safely inside the lines. More salt is not more hydration. It's the opposite.

Two other cautions are worth knowing. A homemade solution has no potassium, which a proper formulated ORS includes, so for serious or prolonged dehydration the shop-bought option is the safer call. And if you or a family member can't keep fluids down at all, are badly dizzy, or a young child is clearly very ill, that's a doctor's job, not a kitchen remedy. Used sensibly for everyday recovery, though, the humble salt-and-sugar drink remains one of the most useful tricks a South African runner can keep in their back pocket.