For diarrhea, the priority is replacing fluids and electrolytes — oral rehydration solution for heavy losses, water and broth for mild ones.
Diarrhea drains water and electrolytes faster than a glass of water replaces them, and nothing on a shelf can soothe an upset stomach and stop diarrhea outright. The drinks that genuinely help all do one job: putting fluid and electrolytes back at roughly the rate the body loses them. The NIDDK’s guidance puts oral rehydration solution first for heavy losses, with plain water, salty broth, diluted juice, and sports drinks as fair choices for mild symptoms.
What follows is short and specific: which drinks earn a place, which ones quietly make things worse, and the point where a doctor — not another glass — is the smarter call.
Drinks That Help During Diarrhea: What Each One Replaces
Oral rehydration solution is the drink built for this job. It pairs water with glucose and electrolytes in proportions the gut absorbs efficiently, which is why it leads for severe diarrhea, heavy fluid loss, dehydration risk, older adults, and people with chronic illness. NIDDK’s treatment guidance for diarrhea recommends mixing it exactly as the label directs — no extra powder, sugar, or salt.
| Drink | What It Replaces | When It Fits |
|---|---|---|
| Oral rehydration solution | Water, sodium, and glucose in a measured ratio | Heavy fluid loss, dehydration risk, chronic illness |
| Water | Fluid only | Mild diarrhea and steady fluid intake |
| Salty broth | Fluid and sodium | Mild symptoms, low appetite |
| Diluted fruit juice | Fluid with a smaller sugar load | Mild diarrhea in adults |
| Sports drinks | Fluid plus some electrolytes | Mild symptoms only — not for heavy losses |
| Caffeine-free soda | Fluid | Adults, in small amounts |
| Milk and dairy | Fluid with lactose | Pause it if bloating or diarrhea worsens |
Sweetness is the trap. Very sweet drinks, including soda in quantity, can pull water into the intestine and worsen diarrhea, so juice belongs diluted. Alcohol and caffeine work against you while symptoms are active — skip both. Dairy is worth a pause if it brings on bloating, because lactose intolerance sometimes lingers after a stomach bug.
Buying ahead beats a 2 a.m. pharmacy run. If a stocked shelf sounds easier, our tested roundup of stomach-friendly drinks covers what’s worth keeping on hand.
When Does Diarrhea Need A Doctor?
Prompt medical care is warranted when dehydration is advancing or when warning signs point past a simple stomach bug.
- Signs of severe dehydration, or urination that drops off sharply
- Vomiting that keeps you from drinking anything
- Bloody or black stools
- High fever or severe abdominal pain
- Confusion or fainting
- Diarrhea that is severe or drags on
Older adults, young children, people with weakened immune systems, and anyone managing diabetes, kidney disease, or another chronic condition should get advice sooner, because dehydration risk climbs in every one of those groups. Skip over-the-counter antidiarrheal medicine if blood or a fever shows up; that combination calls for a clinician instead. Severe dehydration can need intravenous fluids in a hospital, and diarrhea has causes — infection, medication, food poisoning, inflammatory disease — that fluids ease without fixing.
How Do You Rehydrate Without Making It Worse?
Start early, sip often, and keep replacing fluid and electrolytes for as long as diarrhea lasts — small amounts beat one big glass when nausea is in the way.
- Begin replacing fluid as soon as diarrhea starts, and keep going between bathroom trips.
- Take small sips often when nausea or vomiting makes a full glass hard to finish.
- Mix packaged oral rehydration solution with the exact water volume on the label — usually 1 liter of safe drinking water — and discard any leftovers as the label directs.
- Never add extra powder, sugar, or salt. A stronger mix is not a faster fix, and skewed electrolyte levels can be unsafe.
- Ask a clinician which product and how much is appropriate if you have diabetes, kidney disease, weakened immunity, or another health condition.
- Ease soft, bland foods back in as symptoms settle; hydration matters more than forcing a meal early on.
Get fluids in early, keep the mix honest, and treat a call to the doctor as part of the plan rather than a last resort.
Common Questions
Can I Drink A Sports Drink Instead Of ORS?
Only for mild diarrhea. Sports drinks add fluid and some electrolytes, which is enough when symptoms stay light, but they do not replace diarrheal losses in the proportions the body needs once things turn severe. NIDDK advises against leaning on them as a substitute for oral rehydration solution when fluid loss is heavy and dehydration risk is high.
How Much Should I Drink In A Day?
Sip steadily rather than gulping, and keep going while symptoms last. Severe cases call for medical evaluation, not guesswork at the kitchen counter.
Do I Need To Follow The BRAT Diet?
No strict BRAT-style menu is required. Soft, bland foods are fine to reintroduce once symptoms ease, and you do not have to force a meal while you feel rough. Fluid and electrolyte replacement matters more than food in the early phase, and small, frequent portions are usually tolerated better than a full plate.
Sources
- National Institute of Diabetes and Digestive and Kidney Diseases. “Treatment of Diarrhea.” Supports the priority on fluids and electrolytes, ORS mixing instructions, and rehydration steps.
- National Institute of Diabetes and Digestive and Kidney Diseases. “Diarrhea.” Background on causes, symptoms, and when to seek care.
- MedlinePlus. “Diarrhea.” General consumer guidance on fluids, foods, and warning signs.