What to Drink When Dehydrated? | Replace Fluids Right

A dusty mouth, a dull headache, and that dragging feeling halfway through the afternoon — dehydration creeps up whether you’ve been sweating in the garden, fighting a stomach bug, or just not drinking enough. The right drink depends on why you’re dehydrated and how fast you need to recover. Water works for most everyday cases, but when electrolytes are in the red, you need something stronger.

When Water Is All You Need

Plain water is your everyday go-to for routine or mild dehydration — the kind from simply not drinking enough or light activity in moderate heat. Your body absorbs it quickly, and it has zero downsides.

For mild dehydration, drink 2 to 3 cups (16 to 24 ounces) of water each hour, or aim for 4 to 8 cups in the first 4 hours, then keep sipping water and other liquids as needed. If you feel nauseated, do not gulp large amounts quickly — take small, frequent sips instead.

When You Need Electrolytes and Oral Rehydration Solutions

Water alone falls short when dehydration is driven by vomiting, diarrhea, fever, or heavy sweating — conditions that flush out sodium, potassium, and glucose your body needs to hold on to the fluid you drink. An oral rehydration solution (ORS) replaces all three at once.

ORS contains water plus electrolytes such as sodium and potassium, and is specifically recommended for dehydration from diarrhea, vomiting, or fever. Brand-name options like Pedialyte are formulated for infants and children in these situations. Oral rehydration sachets that you mix into water are another solid choice. For infants and children, start with about 1 teaspoon (5 mL) every 1 to 5 minutes and increase as tolerated. Older children can drink watered-down sports drinks using 1 part sports drink to 1 part water.

Sports drinks and other electrolyte beverages are better suited for replacing sodium and carbohydrates lost through sweat during strenuous exercise or hot-weather work than for gastrointestinal illness. If you are recovering from yard work or a long run, a sports drink does the job well.

Drinks to Avoid and Practical Tips

Some common drinks make dehydration worse rather than better. Avoid soda and other sugary drinks when treating dehydration from diarrhea — the sugar can worsen diarrhea. Full-strength fruit juice has the same problem for both children and adults. Alcohol and caffeine also worsen fluid loss and should be skipped while you are dehydrated.

Broth, clear soups, coconut water, and diluted fruit juice can help in some cases, but are not as consistently recommended as water or ORS. If you are ready to stock up on the right options, our tested roundup of the best dehydration drinks covers which products actually deliver the electrolytes you need.

When Home Treatment Is Not Enough

Severe dehydration is not something to handle at home. If dehydration is accompanied by confusion, fainting, minimal urine output, or the inability to keep liquids down, self-treatment may be inappropriate and IV fluids may be required. Seek urgent medical evaluation in those cases — the same applies if you cannot keep any fluids down for more than a few hours.

The Cleveland Clinic notes that for most adults, replacing lost fluids and electrolytes with the right drink resolves mild to moderate dehydration within a few hours if you sip consistently and choose according to the cause.