Across from my living room window is a water storage warehouse. What's usual is that no one works inside the warehouse. From my living room window I occasionally see small open-back trucks drove up to load water but I have never seen water offload. The only thing I can see inside the warehouse is a water hose and stocks of nicely pack water bottles. There's no water treatment facilities inside the warehouse so I'm wonder about the water purification. This's just personal observation because I spent lots of time on my computer looking at the warehouse.
I also noticed my hotel water taste like tab water so I have ordered delivery from another company.