Subject: How much water does the human body need per day to

I am a Science teacher, and a student asked me if a person were 
stranded on an island with no fresh water to drink and only fruit to eat, 
then how much of the fruit would he or she need to eat in order to survive. I 
told her it depended on what fruit, because different fruits have different 
water contents, and on how much water the human body needed a day. I 
said as soon as we figure out how much water the human body need in 
order to survive, then we could conduct experiments to find the water 
content of various fruits. It would be great if you could supply the answer, 
because the answer to this question would begin the wonderful 
opportunity for the students to use math and science to find their own 
answers. Thank you... and good luck! (I have been searching for this 
information for 2 days now.)

Re: How much water does the human body need per day to