Better make that a 10 year supply of food and drinking water, plus a hospital’s worth of medical supplies. Just foe starters. An EMP burst is like a F5 tornado compared to a summer breeze; a summer breeze that lingers for a few moments and goes away, an F5 tornado remains in place for decades.
Third world countries will be paradises compared to the remains of the US. The prognosis you cite is hopelessly naive.
I certainly hope the US is prepared to do the same to Russia if they do it to us. It will be interesting to see how today’s news shakes out as Congress awaits or gets briefings.