Eight glasses is not a personal prescription for every adult. It is also not a reason to dismiss fluid guidance or stop measuring an intake your clinician has asked you to track. A useful hydration routine considers access to drinks, weather, activity and individual care needs.

Put the number in context

The NHS describes six to eight cups or glasses of fluid a day as a guide, with needs potentially higher in heat, during prolonged activity, pregnancy or breastfeeding, and illness. This includes drinks other than plain water. Foods also supply some fluid.

Water is a simple everyday choice. Tea, coffee and milk can contribute to fluid intake too; that does not make unlimited caffeine advisable. You do not need to buy a specialist drink just to make an ordinary desk-day routine count.

If you have a prescribed fluid allowance, follow it. Ask your care team what changes, if any, to make during hot weather or illness instead of following a general online target.

Make drinks easier to reach

Look for the practical gap. Do you leave for a long commute without a drink? Is your bottle hard to open? Do you depend on someone else to bring water? Solving that barrier is more useful than adding another reminder you cannot act on.

You might put a drink within reach at your desk, take water for a journey or arrange help with refills. Meals and breaks can be convenient opportunities to drink regularly. A water-containing food such as soup or fruit can contribute, but it should not become a reason to ignore access to drinks.

These are adult routine suggestions, not infant-feeding instructions or a replacement for advice about swallowing difficulties. If drinking safely or independently is difficult, ask for appropriate support.

Do not use thirst as the only check

The absence of thirst is not a guarantee that you have had enough fluid. Older adults and people who depend on others for drinks need particular attention to regular access. Urine colour can be a rough prompt, not a diagnosis or an instruction to keep drinking until it becomes colourless.

During hot weather, think about cooling and breaks as well as water. If you have been told to limit fluids, the National Institute on Aging advises asking your clinician what to do in the heat. Do not change prescribed medicines yourself.

Know when to ask for help

Persistent excessive thirst despite drinking, especially with frequent urination, needs medical advice. Do not explain it away as salty food or a dry office.

For vomiting or diarrhoea, a pharmacist can advise whether an oral rehydration solution is appropriate. Buttermilk or a sports drink is not automatically an equivalent treatment.

Seek urgent medical help for signs such as ongoing dizziness on standing, much less urine than usual or a fast heartbeat. Confusion, difficulty breathing or being difficult to wake with suspected dehydration needs emergency help. Do not wait to finish a bottle or reach a daily target before seeking care.

Sources

• Water, drinks and hydration (opens in a new tab), NHS.
• Dehydration (opens in a new tab), NHS.
• Excessive thirst (opens in a new tab), NHS.
• Hot weather safety for older adults (opens in a new tab), National Institute on Aging.