Quick answer
The NHS uses 6 to 8 cups or glasses of fluid a day as a general guide. Water is a simple choice, but lower-fat milk, sugar-free drinks, tea, coffee, and fluid from food can also contribute. You may need more in hot weather, during prolonged activity, when ill, or in pregnancy or breastfeeding. Dark yellow, strong-smelling urine or passing urine less often can be signs of dehydration. If you are dizzy when standing and it does not go away, unusually tired or drowsy, cannot keep fluids down, or are concerned about a child or older person, get advice from NHS 111 or a qualified clinician.
For an explanation of formats, read the electrolyte tablets vs powders guide. For related general support, see the cold and flu comfort guide, headache support guide, and low-cost support basics.
Open the FinderWhen everyday hydration advice is not enough
Dehydration can happen when the body loses more fluid than it takes in. Vomiting, diarrhoea, a hot environment, prolonged sweating, a high temperature, and some medicines can all raise the risk. For vomiting or diarrhoea, the NHS advises fluids in small sips if you feel sick and says a pharmacist can recommend oral rehydration solutions when appropriate. Follow the packet and pharmacist advice; do not treat sports electrolyte products as a substitute for that advice.
Natural support options
Regular fluids through the day
Everyday use: Keep a drink nearby, have drinks with meals, and use pale-yellow urine as a rough check.
Safety notes: Some people need individual fluid advice, especially with kidney, heart, sodium, or fluid-restriction concerns.
Who should be cautious: People with kidney disease, heart failure, fluid restrictions, low sodium history, or medicines that affect fluid balance.
Water-rich foods
Everyday use: Food also provides some fluid. Soups, fruit, vegetables, yoghurt, and other water-containing foods can contribute alongside drinks.
Safety notes: Food choices still need to fit allergies, swallowing ability, diabetes care, kidney advice, and dietary needs.
Who should be cautious: People with swallowing difficulties, restricted diets, diabetes, kidney disease, or medically advised nutrition plans.
Heat-aware routines
Everyday use: In hot weather, drink more cold drinks, seek shade, cool down, and avoid extreme exercise, as advised by the NHS.
Safety notes: Call 999 for heatstroke signs such as a very high temperature, confusion, seizures, loss of consciousness, or still being unwell after cooling and drinking fluids for 30 minutes.
Who should be cautious: Babies, young children, older adults, pregnant people, outdoor workers, athletes, and people with long-term conditions.
When to seek medical advice
- Get urgent advice from NHS 111 if you are unusually tired or drowsy, feel dizzy on standing and it does not go away, are peeing much less than usual, or cannot keep fluids down.
- Get advice for a baby under 12 months, a child under 5 with signs of dehydration, or an older adult or someone with a health condition who may be dehydrated.
- Call 999 for heatstroke signs, including a very high temperature, hot skin without sweating, fast breathing, confusion, a seizure, loss of consciousness, or if someone remains unwell after 30 minutes of cooling and drinking fluids.
- Ask a pharmacist, GP, or other qualified clinician if you have been told to limit fluids, are managing a long-term condition, or are unsure whether a pharmacy oral rehydration product is suitable.
What not to do
- Do not use drinks or products to delay urgent help for heatstroke, serious dehydration, confusion, a seizure, loss of consciousness, or breathing difficulty.
- Do not use sports electrolyte products as a substitute for pharmacy advice when vomiting or diarrhoea may be causing dehydration.
- Do not change prescribed medicines or ignore a fluid restriction without speaking to a qualified healthcare professional.
FAQ
How much fluid should most adults aim for?
UK guidance often uses 6 to 8 cups or glasses of fluid a day as a general guide. This is not a personal prescription. Needs can change with heat, activity, illness, pregnancy, breastfeeding, body size, medical conditions, and medicines.
Is water always enough?
Water plus regular meals is usually enough for ordinary days. Extra checks may matter during heavy sweating, hot weather, vomiting, diarrhoea, or dehydration risk. Ask a pharmacist if illness or higher-risk factors are involved.
Can tea and coffee count toward fluid intake?
For many adults, tea and coffee can contribute to daily fluid intake. Caffeine sensitivity, pregnancy caffeine limits, sleep, anxiety symptoms, bladder symptoms, and some medical contexts may change what is sensible.
Should everyone use electrolyte products in hot weather?
No. Many people can manage ordinary hot days with regular fluids, food, shade, cooling, and reduced exertion. Electrolyte products may be relevant in some heavy-sweating or fluid-loss contexts, but labels and personal risk factors matter.
When are oral rehydration salts different?
Oral rehydration salts are pharmacy-style products with specific mixing directions. They are not the same as general sports electrolyte tablets or powders. Ask a pharmacist which option is suitable for the person and context.
Sources and further reading
- NHS: Water, drinks and hydration
- NHS: Dehydration
- NHS: Diarrhoea and vomiting
- NHS: Heat exhaustion and heatstroke
Final disclaimer
Natural Support Finder provides general educational information only. It does not diagnose, treat, cure, or prevent disease. It is not a substitute for medical advice, diagnosis, or treatment. Do not stop, change, or delay prescribed medication without speaking to a qualified healthcare professional.