I don’t really know anything much, other than what I have read about it, but collectively I can put some thoughts together.
While the flu and pneumonia shot won’t protect you from CV, I think it is still useful because preventing illness in general can make you less susceptible to becoming sick from other things. Being sick from the flu makes it harder to fight other illnesses. Also, if you get the flu and need to be hospitalized, that is not ideal as far as limiting exposure. So I think a flu and pneumonia shot is a good idea, as an indirect measure of reducing risk.
These are just the general recommendations that have been made on reducing the risk of infection:
- avoid crowds
- perform frequent hand washing
- maintain distance when speaking with people
- avoid contact with people and public surfaces (elevator buttons with elbows!!)
- clean surfaces of areas other people have touched
- wash hands well after touching public surfaces
- avoid touching face, mouth, nose
- sorry, hate to be rude, but sneezing and coughing people, just gotta avoid them…hate to be a hater, but…
The spread of germs is so easy. Think about a scenario, like co-worker Larry is walking to the break-room and coughs. He covers his cough with his hand. Then he opens the break-room refrigerator to take out his lunch, and touches the refrigerator door handle with his cough-hand. Hey, thanks Larry! 
Co-worker Betty then opens the door right after him, takes out her sandwich, and eats it with her hands. Yay! Betty was not really pulling her weight on that project anyway!
I think it’s important to have a reasonable amount of food, necessities (things like detergent, soap, toilet paper), and medical supplies (insulin and syringes!!) at home in case there is a run on everything. Be prepared to have everything you need at home for at least two weeks.
For food, I like the simple emergency stash of these two items - ramen noodles and peanut butter. Why? Because they have a shelf-life of like forever, and those two things contain the basic nutrients of carbs, fat, and protein. There are many other ways of doing it - would love to hear recommendations - but those two things last a long time and are super easy to have, and they cover it all - carbs, fat, and protein. (For long term, you’d need other vitamins and minerals and a supply of other things, this is just for the short-term apocalypse).
(Yes honey, I know we’ve had nothing but ramen noodles and peanut butter for breakfast, lunch, and dinner for the past 4 nights, but this is the zombie apocalypse, so suck it up.)
For D supplies, you should have a stash of whatever you think you will need for the short-term. I would recommend having several months of short-term stash.
In the long-term, for me it all comes down to nothing but syringes and rapid insulin. I could live a good life with nothing but those two things. If you want to get fancy, you can buy $20 vials of NPH - without a prescription in most states. (I have a healthy stash of NPH, but not a lifetime supply.)
When I was 5, I lived off nothing but syringes, slow insulin, and NPH. I could do that again if I had to. You could do it also, if you had to.
CGM, fancy basals, pumps, BG meters - those are all luxury items. To stay alive, all you need is food, insulin, and a delivery mechanism. Syringes last almost forever, and can be re-used over and over.