We will consider that the average volume of a cup is 200 ml, that is 0,2 liters.
That means 1 liter of liquid in cups is:
1 liter * 0.2 cup/liter = 5 cups
Then the equivalent of recommended liquid in number of cups is:
2.2 litres * 5 cup / liter = 11 cups of 200 ml each.
