Cities have water pipes that bring the water to homes.
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On the contrary, houses are ALWAYS supplied with a.c.
People who are from UAE have houses made from strong cement but rest bricks.
Distributing pipe
110 Volts (V)
desalinization plants
Persian Gulf
desalination plants
it is collected from the ocean
If it supplied "for drinking" then the citizen of any country would have obvious legal redress if the water thus supplied proven to be unfit to drink. However in some countries the supplied tap water is NOT advertised as "fit for drinking" and needs to be boiled. In this instance the water supplied to citizens would not be suitable for human consumption.
It is supplied, under pressure, through a system of underground pipes.