This certainly will help. Because systems in some countries are unreliable, people have back-up systems or procedures in place. Also, they may not have discarded the previous systems. I am very concerned about large cities. Modern cities were made possible by water purification and sewage treatment plants.
Water systems depend on electricity and telecommunications.
If water systems fail, I think that many people will have to leave the cities. I think that people should think now about where they want to be on New Year's eve. I recommend visiting a relative or friend who lives on a farm, in a small town, or at least in a suburb. I suggest preparing this location now in case you have to stay there for a period of weeks, perhaps even a few months. If the disruptions are large, it will be hard to obtain the parts needed to repair equipment.