lock-down would be last for around 3-4 months and supplies will decrease for sure necessary commodities should be stored , prices will also increase for up to 10-20% or even more until some relief from major export countries or vaccines this situation will continue
3-4 months? You're joking, right?
The typical incubation period of this virus is 5 days. Normal quarantine you're put under in the EU lasts up to 14 days.
Honestly, if they were to quarantine an area for a month, people would start eating each other or simply roaming to find food like zombies. An average joe living in a downtown apartment has food for maybe 3-4 days. If he's forced to ration he may last for a week. Then it's going to be mayhem, especially for people who have small children. I don't believe they have enough formulas and stuff stored to feed them for a week.