They will tell you “when in China do not drink the water”. I had been told this is not because the water is bad. It is because it has a different composition than our water, and will make us sick. 😷 This not entirely correct.
The water here cannot be consumed even by the Chinese people, so all water for drinking is filtered. If you go to a restaurant and get water, ice, a margarita or even a snow cone – you can drink/eat it as it is made with purified water. HOWEVER you cannot drink the water from the tap!
I share this with you as I was very concerned about being sick. I took a water bottle with me to every restaurant until I figured it out. There are some places such as the airport that have drinking fountains with purified water but they are sparse. However you can buy a bottle of water on every block.
You can buy bottled water very inexpensively. The smaller bottle here is 500 ml for 2 Yuan (about 30 cents American) or the 5L bottle was 10 Yuan (about $1.45 American). They also have less expensive water but the Nongfu spring is my favorite.