I've heard from a Mexican buddy that Coca Cola is cheaper in Mexico than drinking water.
It cost around 10 pesos (50 cents) to fill a 19 liter (5 gallon) jug. That’s cheaper than a single 12oz can of coca cola
"A key reason for the rise in consumption is its availability and, in many cases, its lower cost compared to drinking water. In many rural communities in Chiapas, access to safe drinking water is limited, local stores are well-stocked with Coca-Cola, and the company's marketing campaigns have ensured that the drink is always within everyone's reach."