Unless it is different there than here, you are allowed to go out for health and safety reasons. Not dying of starvation falls under the health category
I plan to stick with the same "schedule" I have followed since I retired 6 years ago. I go grocery shopping once a week, buy enough for the week. There are a few things bought in "quantity" that aren't used right off, like I'll buy 4 cans of tuna and not buy again for a month. The 9 mega roll of TP is good for a couple of months. Good thing I'm not out, haven't seen ANY on the shelves for a couple of weeks. I couldn't buy a months worth of the cereal DW eats 6 days a week, there are never that many boxes on the shelf.