The citizens of Cape Town, South Africa are breathing a sigh of relief. “Day Zero,” when water taps for citizens and businesses shut off, had been projected to arrive in April. Restrictions on personal and agricultural water use have bought the city a reprieve. Yet a delay is not a solution. The city’s 4 million people, already constrained to 90-second showers and a meager 13 gallons of water a day, will eventually face a day of reckoning when the taps run dry.