as @elbanditoroso intimated; it doesn’t matter how much money you have or what kind of GDP you put forth. Water, like most of the worlds resources, is only finite. Our failure to recognize it and continue to exploit our Mother Earth exacerbates the situation and Mother Earth does not make allowances for wealth.
Why should there be a water shortage if desalination exists. Many countries take sea water and desalinate it to make regular water. There is no shortage of seawater unless you are a landlocked country and well South Africa is not. So does not make sense to me.