In Deep Water

As well as spending time at the Water Forum in Marseille, we also managed to check out a solar-powered water purification system in rural India which provides dozens of villages with clean water.

We head to California to find out more about the controversy surrounding the authority’s decision to add extra fluoride into tap water. It whitens teeth, but some dentists argue it also carries health dangers.

Finally, how much water do we really need to drink in a day? We speak to mineral water producers and doctors to get the answer.