"The body needs lots of water to carry out many essential functions, such as balancing the internal temperature and keeping cells alive.
As a general rule of thumb, a person can survive without water for about 3 days. However, some factors, such as how much water an individual body needs, and how it uses water, can affect this."
https://www.medicalnewstoday.com/articles/325174
"17And that no man might buy or sell, save he that had the mark, or the name of the beast, or the number of his name."
https://biblehub.com/kjv/revelation/13.htm
"But because most will fear the inconvenience of being unable to buy and sell, or even death by guillotine, they will easily ignore all the signs of the end fulfilling around them to be moved by Satan to accept the mark of the beast."
https://www.remnantofgod.org/mark.htm
"“A great crowd” of people from all nations will survive “the great tribulation,” which will end with the war of Armageddon.—Revelation 7:9, 14."
https://www.jw.org/en/library/magazines/watchtower-no6-2017-november/survive-armageddon/