How many liters of water should an individual drink per day

How many liters and at what intervals should a person drink water…?

http://www.satyalive.com/2008/06/faq-healthy-food-habits.html

A person should drink at least 4 liters of water per day. Generally, people have a habit of consuming water during or immediately after the meal. This is not good as it dilutes the digestive acids inside the stomach and creates indigestion….

How much liters of water must a person drink in a day??

http://wiki.answers.com/Q/How_much_liters_of_water_must_a_person_drink_in_a_day&src=rss0

my science teacher said it woz 2 btw why do u want to know It is for my daughters school project they want to know how many liters ? like I said 2 litres