What preparations are needed in order to safely shelter in place?

Question

Question: What preparations are needed in order to safely shelter in place?

Options:

1.  Lan ports for laptops, printer paper, office supplies, food and water, Duct tape and plastic, plants
2.  Permanently sealed room, direct phone line, 1 gallon of water per person per day, good ventilation
3.  Supplies to seal room, HVAC shutoff, carbon dioxide absorbers, food and water, communications, and a well practiced plan
4.  Supplies to seal the room, HEPA filter, food and water, windows and a well practiced plan

Answer 1

3. Supplies to seal room, HVAC shutoff, carbon dioxide absorbers, food and water, communications, and a well practiced plan

"Supplies to seal room, HVAC shutoff, carbon dioxide absorbers, food and water, communications, and a well practiced plan" are needed in order to safely shelter in place.