How much water do we use in our everyday life? Well, we consume 0.5 litres if we have a drink of tap water, 4 litres if we boil water to make cups of tea or coffee, and don't forget the water for food preparation. If we wash our clothes using the washing machine, we consume around 50 litres of water; if we do the washing up by hand 6 litres or a phenomenal 15 litres if we use the dishwasher!