Inadequate water quality and poor hygiene during long-distance travel or outdoor tours can lead to serious infectious diseases, diminishing the joy of travel or even forcing the cancellation of a trip. Natural events such as earthquakes or floods often disrupt the water supply infrastructure in popular travel regions of Asia and Central America, causing a shortage of drinking water in a very short time. This guide aims to provide assistance on how to ensure access to drinking water, the number one food item, while traveling, during emergencies, and in nature, using practical and simple methods, as well as how to protect oneself from common travel illnesses through prevention. Contents include: basic knowledge about germs and chemical substances in water, human water needs, commercially available portable water purifiers, and improvised safe water purification methods.