In an unconventional solution to Cape Town’s water crisis, a marine salvage expert is suggesting towing a giant iceberg to the city and melting it down as drinking water.

In drought since 2015, Cape Town was due to reach Day Zero about now, the point at which the city’s taps would be turned off, forcing locals to queue for water at guarded standpoints. For now, this doomsday scenario has been pushed back to 2019 .

But Nick Sloane, who led the refloating of Italian cruise ship …