Eureka Report. Alan Kohler talks to Kilter Rural CEO Cullen Gunn and Websters shareholder Chris Corrigan on the merits of investing in water. According to Alan Kohler, ‘it’s a fascinating story about water trading and investment in Australia, in what has become the world’s most sophisticated water market.’  Kohler argues that ‘Australia is a dry place and the key to success in agriculture, and many other things, is water, so long term it’s probably a good investment‘.