1. Not really. I did stock up on rice when I saw it selling out. But that's because I'm allergic to wheat, so rice is a staple in my household. I'm glad I went around to several stores and found some extra rice, but I didn't get nearly enough to last through this entire shut down and rice has still not returned to my store shelves since. I also ordered some extra brown rice flour, but not enough and now that is sold out everywhere as well. Now that meat is starting to get scarce too, we are going to be on on a vegetarian paleo diet when our meat and rice runs out (unless I can keep getting potatoes

).
2. & 3. No. I'm growing a bigger garden than usual instead and My DH will go hunting in the fall. I can't really afford to "stock up" at a store and I expect meat prices to rise. I will be canning and drying and freezing and otherwise preserving everything we grow and/or gather.
4. IDK. Depends on the definition of necessities? While I didn't really stock up I thought about my basic household staple products and made alternate plans for if I couldn't get these things at the store. I have what I need to make my own laundry detergent, dishwashing detergent, soap, hand sanitizer, etc. I have what I need to cook without electricity and I know how to cook just about anything. I think we will have everything we need or we will make do with what we have. I'm more concerned about skyrocketing prices than shortages.
5. I'm not sure. I think things will be shutdown again sooner than the fall. I think by the end of June or beginning of July there will be so many people dead that Americans will change to demanding another shut down and/or greater protections in the workplace if possible. Some businesses will never even open up this time around and many businesses will disappear. Those out of work will have to go find an "essential" job in the food or medical industry if they really want to be employed or they will have to find a way to work at home. I think there will be a turning point when many people realize for the first time that this isn't going away as soon as they thought, and
I hope that people will react by reinventing themselves or innovating new ideas to adapt to Covid restrictions. Because the alternative is that we will see a lot of bad things happen.
MOO.