Multiple choice How much water does it take to produce one litre of milk? 1 litre 10 litres 100 litres 1000 litres Reveal answer Fill a bubble to check yourself D Correct answer Explanation Producing one litre of milk requires a massive amount of water, primarily to grow the crops and feed that the dairy cows consume. This virtual water footprint is estimated to be around 1000 litres of water per single litre of milk.