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It's a well-known fact that human beings [doesn't live|no live|can't live|not live]without water. It's possible to survive quite a long time without food and only several days without water.

So why do we drink water? Why do we get thirsty? The answer is because our body mainly consists of water. If you [breath|breathe|have breathed|will breathe] on a mirror, it will fog up. When we are hot, sweat [is covering|cover|covers|would cover] our body. These water droplets come from your body. We use water all the time, and we need to restock its supply by drinking or eating.

Even firm food contains liquid. Some products like cucumbers [to contain|containing|contains|contain] more water than solid substances. Nevertheless, we still need to drink about 1–2 litres of water every single day. The exact amount depends on your weight: it is estimated that you [need|needs|to need|needed] about 30 ml of water per kilogram of weight a day.