The document discusses water tanks and whether the water they collect is safe to drink. It notes that some people's tanks go unused, wasting money. While many believe tank water is clean, it can become contaminated with bird and possum waste, posing health risks. A few disease outbreaks have been linked to roof-collected rainwater. Stainless steel tanks are better suited for wine, beer and oils rather than drinking water, as they keep liquids colder but tank water may contain unrecognized diseases.