Eight glasses of water—that’s what we’re supposed to drink each day so that we don’t get dehydrated, right? Oh, and we need to specifically drink eight glasses of water. Coffee, tea, and soda have a diuretic effect so you’ll actually lose fluids. So, again, it’s eight glasses of water.
Now, here are the cold, hard facts: Yes, we need lots of water; no, we don’t necessarily need 8 glasses a day; and yes, coffee, tea, juice, soda, and so on do count.