graph based on average household use per quarter of 43 kL

43,479 litres or 43 kL =  91.3 days x 190.49 litres per person x 2.5 people

91.3 average days per quarter 

190.49 litres average daily use per person 1 

2.5 people per household on average 2

reference links

1    SA Water

2    ABS (2016)