You would think the government would have a fact sheet answering questions like this but they don’t seem to provide anything much. There isn’t even any info for travelers coming from any place other than China on the CDC website. It doesn’t look to be updated at all.
I think stocking enough food for a couple weeks and some medicine to provide relief from symptoms, same as you would for a cold or flu, would be a good idea.
As far as your other questions, who knows? The info hasn’t been imparted like it has in some other countries. If you feel you might have Covid-19, contact your health care professional. Call, don’t pop in.
"Former top Maine CDC official on coronavirus: Don’t panic but do prepare
Stockpile up to two weeks of food and toiletries, talk to your boss about working from home if need be, keep an eye on the news and keep your hands washed.
While Dora Anne Mills on Wednesday likened most of her advice to preparing for a long blizzard, she said Mainers need to prepare for the spread of coronavirus infections in the U.S., which the federal Centers for Disease Control and Prevention said this week is likely. Mills is suggesting people stockpile food and toiletries in case they become sick or they find themselves caring for a sick family member." (Portland Herald Press 2/26/20)