Almost all emergency-related profiteering is about non-artificial supply and demand issues. Grocery chains charging 10x as much for water or toilet paper is exactly the kind of thing these laws are meant to prevent.
(If the shortage is long-term, you'll usually want to implement a rationing system to address the shortages, but in the short term this kind of fiat can work.)
(If the shortage is long-term, you'll usually want to implement a rationing system to address the shortages, but in the short term this kind of fiat can work.)