The time a person survives without water depends on several factors, including environmental conditions, individual health and activity level. Generally, it is assumed that a person does not exceed 3 to 5 days can survive without water. In extreme conditions, such as very hot and dry climates, dehydration occurs much faster and survival time may be significantly shorter. Dehydration is a serious medical condition and leads to electrolyte imbalance and causes organ failure, which can ultimately be fatal. Therefore, it is essential to be aware of this and when in doubt, seek help or guidance.