Британский язык. How much water do we need a day? Why

How much water do we need a day?

Its a well-known fact that its absolutely necessary do drink about 2 liters of water a day.

Why do we need to drink water? 

We need to drink water because otherwise our body will suffer from dehydration and we will die. Water also helps us to stay healthy, it helps our skin to look better.

When do we drink water?

When we wake up, we should start our day with a glass of warm water. Then during the day we should drink water before our meals or about 20-40 min after them.