Some things are just too obvious, when they stare me in the face - I was typing away on my book when you're question came back into mind.
I should also have said that there's rainwater, as well; many buildings have gutters and cisterns for this. Which I should have remembered, as my own palace has them for the winter monsoon rains. You'd think I'd be able to remember my own plumbing - which Phil described, from his time in India - but I must be getting old. Or distracted. Or something.
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