Why do I want to say 3 days. Seems like one's body could go longer than that.

a couple days

3-4 days usually.

approximately 3 days

1) According to this source, from 2 days to 10 days, depending on the maximal daily temperature. "The survivor who is in good health, who uses his head, and rations whatever water is at hand may expect to be able to survive according to the following chart. Of course, there are many factors to be considered so your mileage may vary: Max Daily Temperature | Number of Days in the Shade (No Water) 120 F / 48.9 C 2 days 110 F / 43.3 C 3 100 F / 37.8 C 5 90 F / 32.2 C 7 80 F / 26.7 C 9 70 F / 21.1 C 10 60 F / 15.6 C 10 50 F / 10.0 C 10" Source and further information: http://www.survivaltopics.com/survival/how-long-can-you-survive-without-water/ 2) "The approximate amount of days that you could go without water in your organism is anywhere from eight to fourteen days. It all depends on the person. How fast the water and liquids are going out of the body. Sweat, urine, and tears go out of a humans body and it is very hard to predict how the water inside of you is being reduced and by how much." Source and further information: http://hubpages.com/hub/How_long_can_you_live_without_water 3) "Inedia is the alleged ability to live without food, which has been dismissed by the scientific community. Breatharianism is a related concept, in which believers claim food and possibly water are not necessary, and that humans can be sustained solely by prana (the vital life force in Hinduism), or according to some, by the energy in sunlight. The terms breatharianism or inedia may also refer to this philosophy practiced as a lifestyle in place of the usual diet. " "Mainstream scientific theories about nutrition and generally accepted common sense both indicate that a person who follows this practice even in the short term would die of starvation or dehydration. Breatharians have seldom submitted themselves to medical testing, and currently there is no evidence to support their claims. " "Prahlad Jani, a sadhu, spent ten days under strict observation by physicians in Ahmedabad, India, in 2003. The study was led by Dr Sudhir Shah, the same doctor who led the study of Hira Ratan Manek. Reportedly, during the observation, he was given only 100 millilitres of water a day to use as mouthwash, which was collected and measured after he used it, to make sure he hadn't consumed any. " Source and further information: http://en.wikipedia.org/wiki/Inedia 4) "From the years of 1922 until her death in 1962, Therese Neumann said she had consumed no food other than The Holy Eucharist, and to have drunk no water from 1926 until her death. This phenomenon, commonly referred to as inedia, is sometimes claimed by persons who aspire to a reputation of holiness. In July 1927 a medical doctor and four Franciscan nurses kept a watch on her 24 hours a day for a two-week period. They confirmed that she had consumed nothing except for one consecrated sacred Host a day, and had suffered no ill effects, loss of weight, or dehydration. Urine testing two weeks after daily surveillance was dropped, are said to have indicated, however, that she may have begun eating and drinking normally." Source and further information: http://en.wikipedia.org/wiki/Therese_Neumann