In the developing world they do it because that is often the only water fit to drink, and for the poor it is usually a significant expense.
Droitwich Spa became the only salt water spa town in Britain when John Corbett created the first spa, St Andrew's Brine Baths, in 1887 as part of the Raven Hotel.
The only visible water is frozen, and that is probably true of any that is hidden underground as well.
In arid regions, in places feeling a need for the lack of water, underground water resources are often the only source of fresh water.
Soon the only sound was the water tumbling down to meet us, drowning out the voices of the other trekkers.
Officials admit the only solution to the water woes is a change in usage habits, particularly in Mexico City, which uses more water than the rest of the country combined.
It was revealed that the radius and contact angle of the legs mainly accounted for the large supporting force, ensuring that the robotic water strider not only stood but also walked on the water surface.
The project will only see water taken when the rivers flow at over 40m gallons (182, 000 kilolitres) a second.
Today everyone in the city, including in the slums, has access to potable water, only 7% of the water is "lost" (comparatively, in London 28% of the water is not metered or billed for) and the public utility is making money.
Someone switched on the wipers, which only smeared water across the glass.
In 1993 the city's water authority was broke and only the really rich had access to clean water.
With the backing of the local salt 'magnate', John Corbett, the town became the only salt-water spa-town in Britain.
Jeep is not the only manufacturer to water down its SUVs of late.
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And it is not only the water in the Yellow River, which flows through nine provinces, that is at risk from contamination.
The passion surrounding debates about water only reflects the inability of many to put into practice the commitments to which they have officially subscribed.
In statements read at the hearing on Monday witnesses described the "roar" of the river, and how it was cascading over a weir where normally the water was only a few inches deep.
And the demand for water is only increasing dramatically as the global population grows and much of the developing world becomes more industrialized.
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Gone are the days of working in a traditional office setting, where cubicles separate colleagues and the only social interactions occur around the water cooler.
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Studies of what happens to dead whales, dolphins and porpoises have been done in the UK, but only in shallow water where the worms have not yet been found.
Building on the main messages of the 3rd edition of the report (WWDR3), he highlighted that the WWDR4 is now taking this one step further and providing the tools for decision makers inside and outside the "water box" to ensure trade-offs and co-benefits are properly incorporated across the whole spectrum, and not only within the context of water management.
Only 18% of the population have piped water and only 2.5% are connected to a sewerage system.
In the gauzy light filtering through the canopy, the water, which was only a foot deep, looked crystalline.
At first she hardly felt the cold, only the pull of the moving water, as if something were clamped around her ankles.
In the making of a perfect espresso, too, the hot water and the coffee combine only briefly ideally, for 30 seconds.
The following day, word came down from headquarters to drink only wine until the water could be treated.
"The dene at the top was so full, if that had got any fuller the water would have only gone one way - and that was to our houses, " Mrs Werber said.
Mr Gumpert told the jury one of the workers lived in a horsebox with 10 others and the only washing facilities were a cold water tap in the yard and a shared toilet.
The only players are the French and the British water utilities and a handful of American firms.
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