Sarcasm notwithstanding, it doesn't take a genius to understand that you never let your fuel supplies run below half, and come October, order double and keep it topped up, be it coal, gas, generator fuel... And as for other supplies, water butts can be used to provide water to flush the toilet with, and bottled water is a pound a gallon. Essential food stuffs are readily available in long dated tins, so having enough to survive for a week.
If our water and electricity went out today, we could last for four days without leaving the house. If the gas went as well then we might be stuffed as we don't currently have a barbecue...
And that's ignoring the fact that the last time we were snowed in was in 1987