Water water more expensive than Coke?

What's this big thing about Water, especially Purified Water and the use of Water Filters in New Zealand. There definitely has been a move towards the use of bottled water in the Home, as seen by the showing up of rise of companies doing this. There must be a large market, especially if there is enough business for New Zealand water companies to be part of it. We do have a lot of water, when the 6 million sheep are not drinking it......