An astonishing four million Britons have not had a glass of water in over a week, a new survey suggests.
The statistic is worrisome, experts say, because inadequate hydration can have significant health effects.
Some 52% of Brits go for coffee or tea over a glass of water, the Mirror said, citing research done by SodaStream, with 38% saying water is boring.
Less than one in four regularly drink the recommended daily intake of two litres of water a day and, alarmingly, 15% admit to consuming more alcohol than water.
While severe and long-term dehydration can cause serious health problems, mild dehydration causes headache, general discomfort, dry skin, confusion, unexplained tiredness and irritability.
'Vital part of diet'
"Water is the healthiest way to hydrate; it energises us, aids digestion and weight loss and improves the complexion to name just a few of the benefits," GP Dr Ellie Cannon said.
"Despite this, many people are drinking far less than they should and their health could be suffering as a result.
"One in five GP visits in the UK is down to tiredness and fatigue. It is thought that dehydration could be a culprit in over 12 per cent of cases.
"Simple tricks like adding a little sparkle to your water can help encourage you to drink more water every day and you'll be feeling healthier and re-energized before you know it."
Fiona Hope, managing director of SodaStream UK, added: "The perception that water is boring isn't necessarily surprising, but it's worrying to see the extent people are neglecting such a vital part of their diet."