"..adequate intake of 125 ounces (about 15 cups) for men and 91 ounces for women (about 11 cups).."
https://www.hsph.harvard.edu/nutritionsource/healthy-drinks-full-story/
These findings, along with epidemiologic and intervention studies suggested a potentially important role for water in reducing energy intakes, and by this means a role in obesity prevention.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2929932/
Guideline for Drinking Water Quality - World Health Organisation
http://www.who.int/water_sanitation_health/dwq/gdwq0506.pdf
Rujukan/Reference :
www.islam.gov.my
www.halal.gov.my
www.wqa.org
http://aham.org/
ahamverifide.org
ahamverifide.org