The Dutch use 100 litres of water per person per day to drink, wash, shower and flush the toilet, according to research by Twente University.

Another 3,300 litres of water are used indirectly to make the products people use and consume. Among the top five water-guzzling products used everyday are: short-sleeved t-shirts (2,700 litres), chocolate bars (2,400 litres) and 100 grams of beef (1,500 litres), the researchers say.