Does drinking water help you from getting sick?

Yes. Water intoxication can decrease your bloodstream's sodium level such that seizures, as well as coma and death, may occur.

Answer:

8 glasses a day (or more) is safe, just don't drink them all at the same time. More than one liter (quart) per hour over several hours, can be dangerous, since it dilutes essential minerals in the bloodstream (electrolytes). But if you spread it around over the course of the day (like 1-2 cups per hour), it won't hurt you.