A stomach bug can turn a normal Tuesday into a dehydration problem by lunchtime, especially when the pharmacy is closed or everyone in the house is sick. Knowing how to make homemade oral rehydration solution is a useful household skill, but it needs to be done precisely. Too much salt can be dangerous. Too much sugar can worsen diarrhea. This is one area where “close enough” is not good enough.
Commercial oral rehydration solution packets and ready-to-drink products are the better first choice when you have them. They are formulated with specific amounts of sodium, potassium, glucose, and other ingredients that help the intestine absorb fluid. A homemade version is a temporary backup for mild dehydration when commercial products are unavailable, not a replacement for medical evaluation or treatment.
When to make homemade oral rehydration solution
Oral rehydration solution is meant for fluid loss from diarrhea, vomiting, heavy sweating, or fever. It works better than plain water alone in many of these situations because the right balance of salt and sugar helps the body absorb water through the gut.
In our home first-aid supplies, we keep commercial electrolyte packets for this reason. They are compact, shelf-stable, and require less judgment when somebody is tired, sick, or caring for a child at 2 a.m. Generic packets often cost about $4 to $8 for a box, while ready-to-drink pediatric electrolyte solution commonly runs $6 to $9 per liter. Prices vary by store, but the convenience is worth it.
Still, a power outage, storm closure, or a depleted medicine cabinet can leave you with no packets. The homemade recipe below uses ordinary table salt and white granulated sugar. It is appropriate only when you can measure accurately and have safe drinking water.
The exact homemade oral rehydration solution recipe
For 1 liter of safe drinking water, mix:
- 6 level teaspoons of white granulated sugar
- 1/2 level teaspoon of regular table salt
Stir until every grain dissolves. The finished liquid should taste mildly sweet, not noticeably salty. If it tastes salty, discard it and make a fresh batch with careful measurements.
Use a real measuring spoon set, not a kitchen spoon from the drawer. Level each spoonful with the straight edge of a clean knife. Do not use heaping teaspoons, rounded teaspoons, tablespoons, sea salt, salt substitutes, flavored salt, brown sugar, honey, or sports-drink powder. Each of those changes the formula enough to make it less reliable.
One liter equals 1,000 milliliters, or about 4.23 US cups. This matters. Four cups is short of a liter, and using the same salt and sugar amounts in too little water makes the mixture too concentrated. A clean 1-liter bottle with a fill line is the simplest tool. I mark one dedicated bottle in our medical tote with tape labeled “1 L – ORS only” so nobody has to do kitchen math under stress.
If your tap water is normally safe, use cold or room-temperature tap water. If the water supply may be contaminated after flooding, a broken water main, or a boil-water notice, use bottled water or properly treated water. The recipe cannot make unsafe water safe.
Do not improvise with sports drinks
Sports drinks are made for exercise, not for replacing diarrheal fluid losses. They are usually too high in sugar and too low in sodium for this job. Soda, fruit juice, sweet tea, and undiluted broth have similar problems. They may be better than nothing for a person who refuses all fluids, but they are not oral rehydration solution.
Broth can also be much saltier than people realize. A canned chicken broth may contain 700 to 900 milligrams of sodium per cup, and the amount varies widely by brand. It is useful food when someone is recovering, but it is not a formula you can dose with confidence.
Give small amounts, often
A person who is nauseated may vomit a full glass of fluid but tolerate a teaspoon every minute or two. Start slowly. For an older child or adult, offer small sips every few minutes and increase as tolerated. For a young child, use a spoon, oral syringe, or small cup rather than pushing a large drink.
Breastfed babies should continue nursing. For infants, frail older adults, and anyone with a chronic medical condition, contact a clinician early rather than trying to manage ongoing fluid loss at home. People with kidney disease, heart failure, diabetes, or a medically directed fluid or sodium restriction may need individualized advice.
As vomiting settles, return to regular foods as tolerated. Plain, familiar foods are usually easier at first: rice, toast, potatoes, soup, crackers, bananas, yogurt if tolerated, or whatever modest meal sounds manageable. The goal is not to force food. The immediate priority is keeping fluids down and watching for improvement.
Storage and sanitation rules
Make only what you expect to use in a day. Refrigerate the mixed solution in a clean, covered container and discard it after 24 hours. If it has been sitting at room temperature for hours, especially after someone has drunk directly from the bottle, discard it sooner and mix a new batch.
Label the container with the mixing time. In a busy household, an unlabeled bottle in the refrigerator becomes a guessing game, and guessing is unnecessary. Sugar water can support microbial growth, particularly if a sick child has sipped from the container.
Keep the dry ingredients simple and available. A one-pound bag of sugar and a canister of plain iodized table salt cost only a few dollars and have a long storage life when kept dry. For the actual medical kit, add measuring spoons, a permanent marker, a clean 1-liter container, and commercial oral rehydration packets. This is a small, affordable layer of preparedness that serves a real household need.
Red flags that need medical care
Homemade solution is not the right answer for every case. Get urgent medical help for signs of severe dehydration, serious infection, or another underlying problem. Call 911 or seek emergency care for confusion, fainting, inability to stay awake, difficulty breathing, a seizure, blue or gray skin, or a person who cannot safely swallow.
Seek prompt medical advice for these situations:
- No urine for 8 hours in an adult, or significantly fewer wet diapers in an infant
- Very dry mouth, no tears when crying, sunken eyes, marked weakness, dizziness, or rapid heartbeat
- Repeated vomiting that prevents fluids from staying down
- Bloody or black stool, green vomit, severe abdominal pain, or a stiff neck
- Diarrhea with high fever, or symptoms that are worsening instead of improving
- Any dehydration concern in an infant, a very elderly adult, or someone with major chronic illness
A child can decline faster than an adult, and older adults may not feel thirst as reliably. Trust the pattern you see. A person who is becoming less alert, drinking less, or urinating less needs more than a home recipe.
Build the backup into your household plan
The practical approach is to store commercial oral rehydration packets and know the homemade formula as the fallback. Check packet expiration dates twice a year when you change smoke-alarm batteries or rotate pantry supplies. Keep the recipe printed inside your first-aid kit, not saved only on a phone that may be dead during an outage.
Tonight, measure one liter into a clean bottle, tape the formula to it, and place it beside your electrolyte packets and measuring spoons. That five-minute task removes one more decision from a difficult day.