To find out how much water is lost over 21 days, you can multiply the daily water loss by the number of days.
The daily water loss is 6.14 liters, and over 21 days, the calculation will be:
\[ 6.14 , \text{liters/day} \times 21 , \text{days} = 128.94 , \text{liters} \]
So, the total amount of water lost over 21 days is 128.94 liters.