The CT had 130 liter when we left home plus an additional 10 liter in a jerry from Exmouth.
The jerry was used for the toilet and the water tank was 1/4 full after 1.5 week away.
That's including 1 time washing our hair with the hot water system.
We cooked every day, drank coffee and tea and water. That's for 2 adults and 2 kids.