He says he drinks 8 glasses (~2L) of water a day by noon. This is not an overly excessive amount, but it is not normal. The kidneys can remove 1L of water an hour[0], so make sure not to drink more than that or you will be at risk of water intoxication.

[0] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4027093/