You could consider additional sealed areas. For example our main bedroom has about a 3 foot area as entry to the bedroom, with closets on each side. So We could put plastic at the end of that area as well as the door.
In addition, another plastic hung about 3 foot from the door in the hallway. That way, if I had to go into the room, I could wear layers. First layer comes off in the entry way. 2cnd layer comes off in hallway enclosure. So forth.
It’s hard to really isolate at home because there’s no way to really keep the air totally inside the room—hospitals have special airflows set up for that.
I think also about making sure that the immune system is supported. Adequate sleep is one important requirement and nutrition/vitamins to help be in good shape before exposure.
And don’t forget chicken soup—bone broth soup with lots of garlic and star anise. You could put a crock pot in the room and disposable cups and the patient could drink the broth when wanted. Also need plenty of hydration-water and popsycles are good.
Get all surface areas cleared as much as possible, so that it can be wiped down frequently with wipes which kill corona virus. Plenty of handwashing needed. Patient should wear a mask to help keep from spreading it. Caregiver also wears a N95 or N100 mask and goggles, gloves etc. Plenty of hand cleaner, soap and tissues etc.
If you run out of protective gear—improvise. I’m thinking trash bag clothes with duct tape and there are vids showing how to make your own masks and facial shields.
That’s about all I can think of for now.
IIRC, one woman in Africa nursed her Ebola infected family and wore garbage bags and used lots of clorox.
Good idea on the crock pot.