Drinking unfiltered rainwater will not make you sick, according to researchers from Monash University in Melbourne, Australia. Scientists examined the health of 300 households that collected rainwater for drinking purposes. Although all families were given a filter for their water, only half of the filters worked. After one year, researchers found no sizable difference in gastro illnesses between the two groups of rainwater drinkers, or between rainwater drinkers and those who drank regular tap water. It is possible that the study participants already had a resistance to any parasites because they previously drank rainwater. However, researchers still encourage people to use this eco-friendly water resource, especially for uses such as bathing.