Your dad makes a cup of tea at ten in the morning. At three in the afternoon it's still on the side table, cold and half full. When you ask, he tells you he's had plenty to drink today. He means it.
For someone living with memory loss, drinking enough is harder than it sounds. They may not feel thirsty, may forget they haven't had a drink, or may not recognise the glass in front of them as something to pick up. And because dehydration can make confusion worse, a quiet problem can quickly look like a bigger one.
This guide focuses on practical ways to help someone with memory loss drink enough. For the wider picture of why dehydration is common in later life and how much older adults should aim for, see our guide to hydration in older adults.
Why Memory Loss Makes Drinking Harder
Dementia UK explains that people with dementia may not always recognise when they are thirsty, or may not be able to tell anyone. It lists a range of reasons someone might not drink enough, including:
forgetting to drink
difficulty recognising or expressing thirst
losing interest in drinks because of low mood
trouble concentrating long enough to finish a drink
not recognising a drink for what it is
difficulty holding or lifting a cup
changes in taste, often towards sweeter or stronger flavours
mouth problems such as sore gums, ulcers or dentures that don't fit well
difficulty swallowing
Most of these aren't about willpower. That's useful to remember when you're on your fourth "Have you had a drink, Dad?" of the day. The fix is usually a change to the environment or routine, not more reminding.
Why Dehydration Matters More with Dementia
The Alzheimer's Society notes that dehydration can cause headaches, more confusion, constipation and urinary tract infections, all of which can make dementia symptoms worse. Dementia UK adds that even mild dehydration can noticeably affect thinking, leaving the person more confused than usual.
That overlap is the tricky part. Confusion, irritability and sleepiness can be dementia, dehydration or both. Dementia UK suggests that if someone's dementia seems to have suddenly got worse, it's worth encouraging fluids. If things don't improve, get medical advice.
Signs of Dehydration to Watch For
Based on Dementia UK's guidance, look out for:
more confusion or agitation than usual
seeming sleepy, vacant or withdrawn
mood changes or headaches
a dry mouth or dry, cracked lips
passing urine less often, or dark urine
constipation
dizziness or light-headedness when standing
Don't rely on the person telling you they're thirsty. Changes in behaviour and toilet habits are usually the easier clues for a family member to spot.
Practical Ways to Help Someone Drink More
Every person is different, so expect some trial and error. These are the approaches that tend to work.
Hand them a drink instead of asking
"Would you like a drink?" often gets a "No, I'm fine." Handing someone a cup and saying "Here's your tea" usually works better. Put it in their hand or right in front of them.
Drink together
Dementia UK suggests sitting down and having a drink with the person, and giving them time without rushing. People often copy what's happening around them. A shared cuppa is also a nicer moment than a supervised glass of water.
Make the drink easy to see
If someone struggles to recognise a drink, a clear glass of water on a pale table can almost disappear. Try a coloured cup that stands out, and keep the drink in their line of sight rather than off to the side.
Offer what they've always liked
Dementia UK recommends thinking about the drinks the person enjoyed in the past. It also notes that all fluids except alcohol count, including tea, coffee, milk, hot chocolate, juice and squash. If tastes have shifted towards sweeter flavours, a slightly stronger squash may go down better than plain water.
Try different temperatures and cups
Some people want an ice-cold drink, others only drink something warm. A mug with a handle, a lighter cup, a lidded cup or a straw can help if holding a drink is getting harder.
Count food too
Fluid doesn't only come from cups. Dementia UK lists jelly, soup, yoghurt, custard, watermelon, pineapple and cucumber as foods that contribute. The Alzheimer's Society suggests ice lollies and milk jellies too. For someone who won't finish a glass, a bowl of soup at lunch genuinely helps.
Build drinks into the day
Tie a drink to things that already happen: waking up, each meal, tablet time, a favourite TV programme. Our guide to daily routines for people with early dementia shows how to build these anchors.
Use reminders that make sense to them
A phone alarm that just beeps may not mean anything. A reminder that says what to do, or a short video from someone they know, is easier to act on. We compare options in our roundup of hydration reminder apps for seniors.
Keep an eye on the mouth
Dementia UK points out that sore mouths, dental problems and dentures that don't fit can put people off drinking. A dental check is worth it if drinking has dropped off.
Track it gently
You don't need to measure every millilitre. Filling a jug in the morning and seeing how much is left by dinner gives you a rough picture. Tick marks on a kitchen whiteboard work too. Keep the tracking low-key so it doesn't feel like a test.
Elli Cares sends gentle reminders through the day, and the daily check-in lets someone log what they've had to drink. Family can record a short video reminder in their own voice ("Time for a cup of tea, Mum") and see the activity log from wherever they are. Elli doesn't diagnose dehydration, but it gives families a clearer picture of the week so a drop in fluids gets noticed and raised sooner.
A Note on Evening Drinks and Toilet Worries
Some people cut back on drinks in the afternoon because they're worried about getting up in the night or not reaching the toilet in time. It can seem sensible, but it often means they don't drink enough overall. Try front-loading drinks earlier in the day, and make the route to the toilet easy with good lighting.
If someone has heart failure, kidney disease or a fluid limit from their doctor, follow their care team's advice rather than general tips. The same goes for alcohol: the Alzheimer's Society notes it can increase confusion, add to dehydration and interact with some medications.
When to Get Medical Help
Contact the person's doctor if they:
won't drink at all, or are drinking very little despite trying these tips
can't keep fluids down
are passing very little urine
seem suddenly much more confused, drowsy or unwell
are coughing or choking when they drink
Sudden confusion always needs checking, whatever the cause. Our guide to sudden confusion in seniors explains what to look for. Problems with swallowing should be raised with a doctor, who may refer to a speech and language therapist.
Frequently Asked Questions
How can I get someone with dementia to drink more?
Hand them a drink instead of asking, sit and drink with them, offer drinks they've always enjoyed and use food with a high water content. Build drinks into existing routines like meals and tablet time.
Why won't my parent with dementia drink water?
They may not feel or recognise thirst, may forget, may not recognise the glass, or may find drinking uncomfortable because of mouth or swallowing problems. Plain water can also feel boring if tastes have changed.
Can dehydration make dementia symptoms worse?
Yes. Dehydration can increase confusion and contribute to constipation and urinary tract infections, which can make dementia symptoms worse. If someone's symptoms suddenly worsen, encourage fluids and seek medical advice if they don't improve.
Do tea and coffee count?
Dementia UK says all fluids except alcohol count, including tea and coffee.
Small Changes Add Up
You don't need a perfect system. Pick two or three ideas from this list, try them for a week, and keep the ones that work. You can read more about how Elli supports daily routines on our Seniors and Families page.
