Bottling filtered tap or spring water and delivering to a 24-hour convenience store is not the same as planning, building and maintaining bulk water supply services, so your (and Ivo's) comparison with Coke is facile.
Bulk infrastructure must be planned decades in advance because it's extremely complex and costly. And it's vital to have and project accurate data and about variables that might impact demand. That's why DA-De-Limberg's, w/ government's, negligence and incompetence is so startling (the DA always claim they're different to the ANC!). Their belated, desperate, dazed and confused approach is like a person facing financial ruin betting her family's future and security on a throw of the dice at a casino, making it up as they go along rather than strategic planning w/ the ability to react tactically as needed. Two seasons of poor rain and they HOPE 2017's will be different so they do nothing until it's too late? They should have taken action about desalination long ago.