How does one plan for the long run, like >6 months or so?
I'm sure others may have better suggestions than I, but if the infrastructure/utilities are down for that long, my only suggested option would be to have a bug out location owned by yourself, friends or family in a rural area or small town/community that can band together to better provide those services.
Your larger cities and dense metropolitan areas by that time will likely be under tight control by military in order to prevent anarchy, or it will be like living in downtown Manhatten in the 1981 movie, Escape From New York. I say that slightly tongue in cheek, but really all one has to do is to reflect back on what happened in New Orleans in a scant 24-48 hours after Hurricane Katrina hit back in 2005, then imagine what it would have been like if those initial conditions continued for 6 months. Civilization really does possess only a very thin veneer.
I’ll add one other thing to my previous post. The answer I gave you was based on living in a high population density area/city/suburb. Those in rural areas like me, may have different options to choose from that those in the city may not have, as far as cooking fuel source. I own 100 acres of woodland. I have enough fuel to cook and heat for the rest of my life, whereas, if I or my family need a doctor which is 15-20 miles away and no fuel is available, you may be in a better position to have that access by living in a town/city.