Why is Coke cheaper than water? 

Lidl Freeway Cola and Aldi Vive Cola were sold at 42p each for two litres, meaning the maximum sugar intake cost the equivalent of just 4.8p.

While supermarkets are keen to slash prices of cola and other fizzy drinks, bottled water costs far more per litre in contrast.

For example, a 1.5 litre bottle of HIghland Spring sparkling water costs 75p.

The price war on cola flies against recent health research which suggests that cutting the amount of sugar in sweetened drinks by 40% could prevent 300,000 cases of diabetes and one million cases of obesity.

Source:

http://www.dailymail.co.uk/news/article-3392531/How-supermarket-cola-cheaper-buying-bottled-water-serving-contains-child-s-entire-daily-sugar-allowance-cost-little-5p.html