BIÉNNE HUISMAN, BIRD STORY AGENCY EVERY day, residents of South Africa’s economic hub, Johannesburg, wake up wondering whether there will be water in their taps. Just more than 1,000 kilometres away, in Gqeberha, a water crisis is unfolding, too. These won't be the last African cities to worry over a looming "Day Zero" when water runs out. But there are ways to avoid it happening. Cape Town has been there and done that – and knows that without careful planning and preparation, there could easily be a repeat of 2018’s “Day Zero” crisis. “Day Zero” was to mark the onset…