1. where is the water source for millions of residents in Chang' an city and how to store it?
2. What tools do you use to drink water?
In fact, we ancients were still very wise. There is Weihe River in Chang 'an, and there is no shortage of big water sources. The wells drilled by the ancients produced a lot of water. In addition, China's ceramics can be traced back to thousands of years ago, not to mention tools. I remember drinking water with wine and bottled water when I was a child. At that time, the pollution was far less serious than ours, and drinking raw water directly with your mouth was nothing.