During my time as a JW were were told (via Awake! articles, mostly) not to stockpile anytihng (except maybe a couple of extra cans of coffee, no joke!) because people would just carry it off anyway once they figured out JW's were prepared. Strong emphasis was placed on reliance on Jehovah to provide.
In more recent years there have been stories about government-prepared internment camps just waiting to be filled with JW's, in which case the government would act as host, providing food, shelter, and clothing. The scripture used to support this line of reasoning was the one that says they (the worldly people) are bread to us.
Long ago I met a PO and his wife who were spending a lot of money on exotic plants for their garden. One of the most expensive plants wasn't even expected to bloom for another 17 years! I asked how they could justify the expenditure and they said only the wicked people were leaving, the earth would still be around, so it was OK to build and to plant while at the same time expecting The End to arrive any day. I suppose WT thinks along the same lines; they're still building. Wouldn't it make good sense to distribute the money they've collected among the publishers so that they could work at the full time ministry right up to The End?
The way I see it, rolling blackouts and lack of basic skills aren't going to be the biggest problems. I don't want to be in the city when the toilets no longer flush!