Just one in ten Britons drinks the recommended amount of water when visiting hot countries, new research suggests.
A survey by online travel agency Sunshine.co.uk questioned 1,762 adults who had been on holiday to a hot country in the previous 12 months.
The average person estimated that they drank one litre per day on their last holiday abroad.
Yet people are generally advised to drink around 1.9 litres per day in normal circumstances and even more when they are on holiday.
Just nine per cent of respondents said they drank the recommended amount of water on their last holiday abroad, meaning that the vast majority of Britons could be in danger of getting dehydrated while overseas.
Chris Clarkson, managing director of Sunshine.co.uk, said: 'People need to remember that the hot weather on holiday can make you sweat more and therefore make you more dehydrated.'
He added that alcohol and caffeinated drinks are known to be diuretics, which means they 'won't do the same job as water when it comes to hydration'.
However, despite the need to drink plenty of water, Britons should be wary of drinking tap water in places where hygiene is a concern, with bottled mineral water being the safest option in these instances.