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After contamination led to hundreds of thousands of people having to boil their tap water for weeks, the team discovers what's being done to ensure our supplies are clean, with some tips to make sure we're getting it right at home. Also, the door-to-door fish scam that's left dozens of homeowners with fish of uncertain, and highly dubious, origin. Plus a test to see why many cereals still include such high levels of sugar. And an experiment to find out if there's any scientific basis to the 'three-second rule' - when food is dropped on the floor, is it still safe to pick up and eat?