I think this is one of those questions that gets a different answer depending on who is asked, lol. Most people will probably say that it needs to be water.
I ran across an article on webmd that is actually referring to how drinking water helps reduce your risk of a heart attack. But their reasoning for preferring water over other drinks makes sense and could be applied to general drinking.
Quote:
They found women who drank more than five glasses of water a day were 41% less likely to die from a heart attack during the study period than those who drank less than two glasses. The protective effect of water was even greater in men. Men who drank more water had a 54% lower risk of a fatal heart attack.
But not all liquids were equal. When researchers included the consumption of other liquids such as coffee, tea, juice, milk, and alcohol, the risk of heart attack increased. Women who drank large amounts of liquids other than water were more than twice as likely to die of a heart attack, and non-water drinking men had a 46% increase in risk.
Researchers say when people drink water it is absorbed quickly and easily into the bloodstream and thins the blood -- helping to prevent artery-clogging clots. But other liquids require digestion, which may require fluids to move from the blood into the gut -- creating a blood-thickening effect.
So the body may digest water better if it is not part of a tea or flavored mixture such as Crystal Light.
A lot of people here drink lots of water and most say that they hated it at first, myself included. However, you get used to it, and you eventually prefer it over other liquids. All I drink is water, v-8, milk, and occasional cups of coffee.
I drink a lot of water. However, I can't stand tap water. I use a Brita water filter pitcher and keep it filled and in the refrigerator. Ice cold filtered water is very refreshing!