The purpose of this report is to show the approach to "the minimum demand for water", which is the concept of defining as the limit volume of water considering the level of keeping one's life and household sanitation in an emergency and urgency piriod. In this paper, authers estimated the ordinary volume and the limit volume of water consumption in bathing based on the questionaire survey, and sized real volume from bathing experiment. And they showed the possibility of decreasing water consumption in bathing.
