Earlier quoted context omitted.
And it’s bigger in area than any two European countries (excluding Russia) combined. Just because there’s a drought in one part of Spain __ there might be plenty of water somewhere in France.
My point is: if there’s a case to fly water (in form of grapes) to Europe, why would they not move water from one place in SA to another?
It could also be profitable to ship out water inside grapes and, at the same time, import an equivalent amount of water in barrels. See it as Europe shipping water to SA to be packed inside grapes.
More likely, though, that is because Europeans are willing/able to pay more for that grapes/water. In a capitalistic world, it is the poor who will feel water shortages most.