There is no direct answer to this question but safe to say that in areas(east coast at altitude exceeding 1000m) daily average approx 5 litre/m2. West Coast between 2&3/m2.
The water should be be potable and although measured in small quantities is sustainable.
A standard net size approx 44m2 x 5 = 220litre/ day (sufficient for a family)
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