I would like to see a decline of "Big water". It astonishes me that bottled water is consistently sold for more than sugar water and not one bottler breaks from the pack and sells it for less. That can only happen with industry wide collusion to fix prices and yet no one in the government does anything about it.
I think my local supermarket sells bottled water for as little as 19p (29c) for 2 litres, as as much as about £2 ($3) so I think you are mistaken.
I'm fairly certain the parent was referring to the 24-unit packs of water, where each bottle is ~500ml.