I drink about 1,5 litres a day, which is probably 64 oz, right? of water, sometimes a bit less, plus a few cups of green tea or herbal tea, one cup of coffee, a glass of juice in the morning, a little milk in my cereal in the morning and a glass with dinner. If I'm riding, add a bit less than one bottle an hour to that. Maybe I should be drinking more, but when I do it makes me feel weird, and it accelerates my digestion even more, which is not something I need.