You need about two quarts of water a day, but you can get this by consuming fruits and vegetables that range from 84% (apple) to 96% (iceberg lettuce) water by weight [see link below]. Drinking eight glasses of pure water a day is ridiculous unless you consume no food at all.
I don't think there's anything ridiculous about drinking 2 quarts of water per day. I easily drink 48-144oz of pure water per day with the 48oz bottle I carry with me everywhere I go (http://store.nalgene.com/Silo-p/2178-0048.htm)
Saying it's necessary to drink that much water might be ridiculous, and perhaps that's what you meant, but I don't think there's anything ridiculous about the activity itself.
http://www.ca.uky.edu/enri/pubs/enri129.pdf