How did Jerusalem function as an ancient city without a major water source? [closed]

Question

Jerusalem seems to be an exception to the rule that all ancient cities must either be on a river or freshwater lake.

First settlement is estimated at 3500 BC.

The nearest major river as far as I can tell from maps seems to be the Jordan River, at ~12mi.

Answer 1

From Wikipedia, which is citing Easton's Bible Dictionary, The Gihon Spring was

a reliable water source that made human settlement possible in ancient Jerusalem – the spring was not only used for drinking water, but also initially for irrigation of gardens.