I think water and milk should not be discussed together. First of all, drink plenty of water every day, especially in dry winter. As for milk, everyone used to think that drinking it before going to bed was good for sleep, but it was not. Drink yogurt before going to bed and milk in the morning, because after drinking milk in the morning and studying at work, milk will be better digested and absorbed. In short, milk once a day and water eight times a day.