Despite perceptions that it's healthier, there is little difference between bottled water and tap water - apart from cost - selling to up to 1,000 times the price, according to the World Wildlife Fund (WWF).
Bottled water is the fastest growing beverage industry in the world, worth up to $22 billion a year, according to the fund. A study commissioned by the WWF found the "bottled water market is partly fueled by concerns over the safety of municipal water and by the marketing of many brands which portray them as being healthier than tap water."