Most dehydration can be fixed at home with the right fluids, a little patience, and a strategy slightly more deliberate than just chugging water. If you’re thirsty, you’re already mildly dehydrated, and the goal is to replace both the water and the electrolytes your body has lost. Here’s how to do that effectively.
Recognize What You’re Dealing With
Mild dehydration shows up as thirst, a headache, fatigue, dizziness, and darker-than-usual urine. You might feel sluggish or notice your mouth is dry. This is the stage where home treatment works well and quickly.
Moderate dehydration intensifies those symptoms. You’ll urinate less frequently, feel noticeably weak, and your heart may beat faster than normal. Your lips and skin may look dry. At this point you still can rehydrate at home, but you need to be more intentional about electrolytes, not just water.
Severe dehydration is a different situation entirely. If you or someone around you is confused, extremely lethargic, unresponsive, or hasn’t urinated in many hours, that requires emergency medical care. Home remedies won’t cut it when the body is that depleted.
Why Plain Water Isn’t Always Enough
When you’re dehydrated from sweating, vomiting, diarrhea, or prolonged heat exposure, you’ve lost salt and potassium along with water. Drinking plain water replaces the fluid but not those electrolytes, and your body needs both to actually absorb and retain the water you drink.
Your small intestine reabsorbs roughly 8 liters of fluid every day, and it does this most efficiently when sodium and a small amount of sugar are present together. The sugar helps pull sodium (and water along with it) through the intestinal wall and into your bloodstream. This is the principle behind every oral rehydration solution, from pharmacy products to the recipe the World Health Organization recommends. Plain water works for mild cases, but adding electrolytes speeds up recovery noticeably.
Make a Rehydration Drink at Home
You can make an effective oral rehydration solution with ingredients already in your kitchen. The WHO-based recipe calls for:
- 4¼ cups (just over 1 liter) of clean water
- ½ teaspoon of table salt
- 2 tablespoons of sugar
Stir until everything dissolves. The result won’t taste great, but it works. The small amount of sugar isn’t for flavor or energy. It’s there to activate that sodium-glucose absorption pathway in your gut, pulling water into your bloodstream faster than water alone would.
If you want to add potassium, a slightly more complete version includes ¼ teaspoon of salt substitute (like No Salt, which is potassium chloride) and ½ teaspoon of baking soda along with the salt and sugar, mixed into 4 cups of water. The baking soda helps if you’ve been vomiting, since it gently counteracts the acid your stomach has lost.
Measure carefully. Too much sugar creates a concentrated solution that can actually pull water into your gut instead of absorbing it, which makes diarrhea worse. Too much salt tastes terrible and can cause nausea. Stick to the ratios.
How Fast to Drink
The instinct when you’re dehydrated is to gulp everything at once. Resist that. Drinking too fast can trigger nausea or vomiting, especially if stomach illness caused the dehydration in the first place.
A steady approach works better: take small sips every few minutes rather than downing a full glass at once. For a rough guideline, aim to drink about a cup (250 mL) every 15 to 20 minutes until your symptoms start improving. If you’re nauseous, go slower, taking a few tablespoons at a time. You can gradually increase the amount as your stomach settles.
Most people with mild dehydration feel significantly better within one to two hours of consistent sipping. Moderate dehydration may take longer, closer to three or four hours of steady intake before you feel recovered.
What to Drink (and What to Skip)
Your best options are water, the homemade rehydration solution described above, or a store-bought electrolyte drink. Coconut water is a reasonable natural alternative since it contains potassium and some sodium, though its sodium content is lower than an ideal rehydration solution. Broth or soup works well too, especially if you haven’t been eating, because it delivers sodium and a small amount of calories.
Some drinks will slow your recovery. Sodas and fruit juices with high sugar concentrations (8% sugar or above) delay stomach emptying and can pull water into your intestines rather than absorbing it, potentially worsening diarrhea. Diluting juice to half strength with water fixes this problem. Coffee and alcohol are mild diuretics, meaning they increase urine output. Neither will help when you’re already behind on fluids. Energy drinks often combine caffeine with high sugar, making them a poor choice.
Eat Your Water Too
Food contributes more to hydration than most people realize. Several common fruits and vegetables are over 90% water by weight, and they deliver electrolytes along with that fluid. Some of the highest-water-content options:
- Cucumber: 96% water
- Celery: 95% water
- Tomatoes: 94% water
- Zucchini: 94% water
- Watermelon: about 92% water
These won’t replace proper rehydration fluids on their own, but they’re a useful supplement, especially if drinking large volumes of liquid feels overwhelming. Eating a few slices of watermelon or cucumber between sips of your rehydration drink adds fluid and potassium without taxing your stomach.
Rehydrating After Vomiting or Diarrhea
Stomach bugs present a specific challenge: your body is losing fluid faster than normal, and your stomach may reject what you try to put back in. The key is starting very small. Begin with a single tablespoon of rehydration solution every few minutes. If that stays down for 15 to 20 minutes, gradually increase to a few tablespoons at a time.
Avoid solid food until the vomiting has stopped for at least a couple of hours. Once you’re tolerating liquids well, bland foods like crackers, rice, or bananas are gentle starting points. These also provide some carbohydrates to help with the fatigue that often accompanies a stomach illness.
With diarrhea specifically, the electrolyte drink matters more than plain water. Diarrhea flushes sodium and potassium out of your system rapidly. Replacing only water without electrolytes can dilute your blood sodium further, which makes you feel worse.
Dehydration in Older Adults
People over 65 are more vulnerable to dehydration for several reasons. The thirst signal weakens with age, so an older person may not feel thirsty even when significantly dehydrated. Kidney function gradually declines, reducing the body’s ability to concentrate urine and conserve water. Many common medications, including blood pressure drugs, increase fluid loss.
Detecting dehydration in older adults is also harder. Traditional signs like skin turgor (pinching the skin to see how quickly it springs back) have been shown to be unreliable in older adults, since aging skin loses elasticity regardless of hydration. Dry armpits turn out to be a surprisingly accurate indicator. Research found that checking for armpit dryness correctly identified dehydration roughly 83% of the time in older adults.
If you’re helping an older family member rehydrate, offer fluids consistently throughout the day rather than relying on them to ask. Small, frequent amounts are better tolerated than large volumes at once. Flavoring water with a small amount of juice or offering popsicles can help if they resist drinking plain fluids.
Rehydrating After Exercise or Heat Exposure
Exercise and hot weather cause fluid loss primarily through sweat, which contains both water and sodium. For moderate activity lasting under an hour, water alone is typically fine. For longer or more intense sessions, or when you’ve been sweating heavily in heat, an electrolyte drink helps replace what sweat took out.
A practical way to gauge how much you need: weigh yourself before and after exercise. Each pound lost represents roughly 16 ounces (about 500 mL) of fluid you need to replace. Drink that amount over the next hour or two, sipping steadily rather than all at once. Your urine color is a simple ongoing check. Pale yellow means you’re well hydrated. Dark amber means you need more fluids.
Signs Home Treatment Isn’t Working
Most mild and moderate dehydration resolves within a few hours of consistent fluid intake. But some situations call for medical help. Watch for urine that stays very dark or absent despite drinking fluids for several hours, a rapid heartbeat that doesn’t settle, confusion or disorientation, or fainting. In children, watch for no tears when crying, a sunken soft spot on an infant’s head, or unusual sleepiness. These signs suggest the dehydration is too severe for oral fluids alone, and intravenous fluids may be needed to catch up quickly.