Water is the single most important thing to drink when you have food poisoning, but it’s not the only fluid your body needs. Vomiting and diarrhea drain water, sodium, and potassium fast, so the best approach combines plain water with electrolyte-rich liquids. How much and how quickly you drink matters just as much as what you choose.
Why Hydration Matters So Much
Food poisoning forces fluid out of your body from both ends. Each episode of diarrhea or vomiting can pull out a surprising amount of water and dissolved minerals your cells need to function. Replacing just water without electrolytes can leave you feeling weak and dizzy even if you’re technically drinking enough, because your blood still lacks the sodium and potassium it lost.
There’s a reason hospitals use saline solutions rather than pure water: your small intestine absorbs water far more efficiently when sodium and a small amount of glucose are present together. A dedicated transport system in the intestinal wall pulls sodium and glucose across as a pair, and water follows them. This is the principle behind every oral rehydration solution on the market, and it’s why a pinch of salt and a bit of sugar in your water genuinely helps.
The Best Fluids to Reach for First
For most healthy adults, the NIDDK recommends these liquids during food poisoning:
- Water: Your baseline. Sip it steadily rather than gulping.
- Diluted fruit juice: Mix juice with water to cut the sugar concentration. Full-strength juice has enough fructose to worsen diarrhea.
- Sports drinks: Convenient and palatable, though not ideal for severe cases (more on that below).
- Broth: Chicken or vegetable broth provides sodium naturally and is easy on a queasy stomach. The warmth can also be soothing.
If you’re an older adult, have a weakened immune system, or are dealing with severe diarrhea, an oral rehydration solution like Pedialyte is a better choice than sports drinks. These products are specifically formulated with the right ratio of sodium, glucose, and water to maximize intestinal absorption.
Sports Drinks vs. Oral Rehydration Solutions
Sports drinks and medical-grade oral rehydration solutions look similar on the shelf but are quite different in composition. A typical sports drink contains about 18 milliequivalents per liter of sodium and roughly 6% carbohydrate. An oral rehydration solution contains about 61 milliequivalents per liter of sodium and only 3.4% carbohydrate. That means a sports drink has roughly a third of the sodium and nearly double the sugar.
For mild food poisoning in a generally healthy person, a sports drink works fine. But if diarrhea is frequent or lasting more than a day, the lower sodium in sports drinks may not keep up with what you’re losing. Oral rehydration solutions are designed for exactly this situation. You can find them at any pharmacy, and they come in liquid, powder, and freezer pop forms.
How to Drink When You Can’t Keep Anything Down
Timing and volume matter enormously when nausea is active. Drinking a full glass of water while your stomach is in revolt will likely come right back up. The Mayo Clinic recommends taking small, frequent sips over a couple of hours rather than drinking a large amount at once. A practical target: one or two tablespoons every few minutes. It doesn’t feel like much, but it adds up, and your stomach is far more likely to tolerate it.
If even small sips trigger vomiting, wait 15 to 30 minutes and try again. Ice chips can be easier to keep down than liquid water, and they force you to take in fluid slowly by default. Once you’ve gone an hour or two without vomiting, you can gradually increase the volume of each sip.
Herbal Teas That Help With Nausea
Ginger tea has real evidence behind it as a nausea remedy. Ginger has been shown to calm the stomach, and sipping it warm between bouts of nausea can make the experience more bearable. You can brew it from fresh sliced ginger root or use a store-bought ginger tea bag. Peppermint tea is another common choice, though the evidence is less robust than for ginger.
Lemon-based teas may also help. A 2014 study found that even the scent of lemon helped reduce nausea and vomiting, though that research was conducted in pregnant women rather than food poisoning patients specifically. Still, a warm cup of lemon tea is gentle on the stomach and contributes to your fluid intake.
What Not to Drink
Some beverages will actively make things worse. Caffeine speeds up the digestive system, which is the last thing you need when diarrhea is already a problem. That rules out coffee, most teas (stick with herbal), caffeinated sodas, and energy drinks.
Full-strength fruit juice and regular soda are high in fructose, which can pull water into the intestines and worsen diarrhea through an osmotic effect. If you want juice, dilute it with at least an equal amount of water. Diet sodas and sugar-free drinks are no better: artificial sweeteners like sorbitol, mannitol, and xylitol are known to cause diarrhea on their own, even in healthy people.
Alcohol is off the table entirely. It’s a diuretic, it irritates the gut lining, and it impairs your body’s ability to absorb water and nutrients. Milk and other dairy products can also be difficult to digest during and immediately after a bout of food poisoning, since the inflamed intestine temporarily loses some of its ability to process lactose.
What About Coconut Water?
Coconut water has a reputation as a natural electrolyte drink, but it’s not a great match for food poisoning recovery. Research measuring coconut water’s composition found that its sodium levels are very low, averaging just 2.9 to 12.5 milliequivalents per liter depending on the fruit’s maturity. That’s a fraction of what oral rehydration solutions provide. It’s also high in potassium and variable in sugar content. The study concluded that coconut water did not contain sodium and glucose concentrations of potential value as an oral rehydration solution. It won’t hurt you, but it shouldn’t be your primary rehydration fluid.
Rehydrating Children
Children dehydrate faster than adults because of their smaller body size and higher metabolic rate. For kids with food poisoning, oral rehydration solutions like Pedialyte are the first choice rather than a backup option. Sports drinks contain too much sugar and too little sodium for a small child dealing with significant fluid loss.
The same sipping strategy applies: small amounts frequently, rather than a full cup at once. Freezer pops made from oral rehydration solution can be especially useful for young children who resist drinking. If a child can’t keep any fluids down for several hours, or if they seem unusually sleepy, confused, or irritable, that warrants prompt medical attention.
Signs Your Fluids Aren’t Enough
Most food poisoning resolves within one to three days, and oral fluids are sufficient for the vast majority of cases. But there are clear signals that home hydration isn’t keeping up. Watch for diarrhea lasting 24 hours or more, a fever of 102°F or higher, bloody or black stool, confusion or unusual drowsiness, and the inability to keep any fluids down at all. Dark yellow or amber urine, dry mouth, and dizziness when standing are earlier signs that you’re falling behind on fluids and need to increase your intake or switch to an oral rehydration solution.