Rationing was necessary because pricing laws stopped prices from climbing. So demand was higher than supply.
Today there would not be rationing. Prices would be allowed to float, so things in short supply just get expensive. Fears of exhaustion cause people to stock-pile.
This is exactly the approach taken during, and after, the pandemic. It's simpler to let people complain about shortages and prices, and the rich can get whatever they like, as much as they like.
Look at the varied response to "stay home and mask up" - actions which are literally trivial to follow. No sane US govt would attempt "rationing" - the population would simply ignore them.