Political ideologies are not the point here, although part of the cause is politics. The issue is that people in Cape Town (and elsewhere in the world) are very interested in living for now without a care for the future. They live under the assumption that the government will provide - which is inherently incorrect. People forget that they have a responsibility to provide for themselves and their family and put aside some for the future. This has not been done by many people and certainly their elected officials.
It is a sad outcome for the lovely people of Africa; however, we can expect this and similar crises to occur in many cities around the world.
Now the government and people will have to pay an organisation, sic Coca-Cola, that has invested significantly to extract resources, process them and set up logistics for delivery. The people and government could have done the same - but chose not to do this in favour of less productive programs of expenditure.