Chile is one of the few countries in the world to have privatised its water supply. The result: businesses, like avocado farms, pour the precious resource over their produce without hesitation - but for households, access is rationed. The system has been in place since the early 1980s and is causing wide-spread protests. Later this month, Chileans will get to vote on the right-to-water issue in a referendum. Paul Cabanis and James Vasina report.