@jennyjoan
Water in = water out, one way or another.
Other variables to consider:
i) are you in a hot climate?
ii) are you in the gym or exercising outdoors a lot?
Water lost through sweating might account for where most of your 2 litres per day intake is going.
In fact, if the climate is hot but windy, you would get dehydrated by evaporation losses even without doing strenuous exercise. To just walk through a desert zone, it is reckoned a person would need upwards of 4 litres per day and they'd barely need to urinate more than once a day.