Why do we need so much water to produce everything?

Question

For example, i’ve read somewhere that we need around 3,7Litres of water to produce a single cigarette and 2700Litres of water to produce a single t-shirt. Why do we need so much water to produce stuff?

In: 96

Answer 1

Also some calculations might be due to economies of scale.

For example a factory producing 10000 T shirts a day might consume 10000 L of water.
However even if you reduce the output to 50 percent. It might still use 10000L water. This is due to the fixed costs that come with economies of scale.