Newbie - Turning a bedroom into a make-shift temp shelter?

We are on very limited funds and in the midst of selling our home so we can't do anything permanent to it or to the property. Not an ideal situation in today's political climate for one who wants to build a real shelter. We DO plan on building a real shelter when we buy our next home in another state.

Making do with the best we can NOW, we decided to focus on only what we can control.

From what I understand, because we live 240 miles west of Los Angeles, in rural Arizona, if an isolated nuclear incident were to happen there, or San Diego, or San Francisco, our biggest concern being this far out would be inhaling fallout dust in the two weeks after.

Is this true?

We have no basement. We are a single story stickframe home in the desert. The roof is gabeled (a 'plus' I read), and we have R36 insulation plus heat shield insulation.

Some places I read online suggesting taping off the house and turning off all AC/heat vents. With information we read, we are considering this -

TURNING MASTER BATH/BEDROOM INTO A TEMP SHELTER
• First - thick 6ml plastic sheeting doubled up and duct taped to the outside of the two large windows and the small bath window.
• Do the same to these windows from the inside
• Nail thick plywood to the windows from the outside.
• Turn off the AC/Heat system
• Seal ALL home ducts with cardboard/duct tape
• Seal all electrical outlets in the room with plastic/duct tape. (Leave one easy to access?)
• If there is time - seal off every other door, vent and outlet in the rest of the home. Not sure about windows?
• Tape a bed sheet over the closed door that provides access to the room from the end of our hallway. Spray it with water at least hourly. This is to insure air comes in, but to help catch/reduce dust from coming in with it.
• If we have electricity - run a large HEPA filter inside our room next to that door.
• 3M Dust respirators rated for vapors, chlorine, hydrogen chloride, sulfur dioxide, hydrogen fluoride, hydrogen sulfide, particles, dust, and 99.7% on solid and aeresols including oil. Yes, we know its not the best out there, but we hope it will prevent contaminated dust from being inhaled?

Concerns - air quality in the enclosed/sealed room. We bought a carbon monoxide detector, and one page online recommends a damp sheet over a vent to allow air into a safe room and to keep dust out. Not sure enough oxygen will get in if we cover the closed un-taped door with it, and not sure if we could keep enough dust out if we don't keep it damp at all times.

Another option is our dryer vent in the bathroom that we planned on filling and sealing off, aims down with a 90 degree angle, and has a flap valve. Maybe we could seal the bedroom door completely and put/maintain a moist sheet on the dryer vent for circulation?

Again, these are plans that would only be for a distant strike that has several tall mountain ranges between us. We understand something closer would be dire no matter what we did here (and our nearby town has no public shelters)

Any advice is greatly appreciated.

Note: We have two months of food from the Wise Company, and many 5 gallon water bottles stored and they would be in the enclosed bedroom closet with us, our battery supplies, baby wipes, emergency (crank/solar/battery) radio, first aid supplies, bleach, guns, ammo, etc. The advantage of the bed/bath combo is we would have a toilet (yay!), toilet paper, and a filled bathtub and washing machine for flushing.

Edited to add: Bedroom is 16'x11', bathroom is another 9'x7' and closet for storing items is 2.5'x8'. We wondered if we should seal off the enclosed closet, as an extra buffer or use it for all our gear/food etc.

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Newbie - Turning a bedroom into a make-shift temp shelter?