I think there's a chance folks need to prepare for something bigger than that. How well would a 90 day food supply have worked for the people of Venezuela? They've been starving for the last several years.
At least you don't live in a city. Depending on when a disaster hits, you might be able to grow a garden and stretch that food supply for more than 90 days.
IMO, everyone should have several years of food. But I understand if you don't. I don't either. But I *will*.
BTW, ten days? Really? You should be able to fast for THAT long!