The main ingredient in Coca-Cola is filtered water. If Coke is cheaper than water in these communities, then why isn't the company selling bottled water for the same price? Their bottling and distribution costs would be the same, while the cost of ingredients would decrease.
It makes no economic sense for Coca-Cola to not sell bottled water in this context. Lacking an economic motive, what's left? Is the assertion that Coca-Cola is actively malevolent and is using their economic power to harm people on purpose at their own expense?