Thank you for that rather graphic question. The bags are durable versions of “contractor” bags, also being black in color. There are portable fans (batteries), & I’m sure someone can handle tying a bag when they are finished using the bathroom.
...but that is only if the necessity arises to have to stay indoors. If there is a civil uprising, or some kind of chemical threat, etc. it would be safer not to leave your house. Otherwise, composting sounds like a good way to go.
I visited a family in a city who had a composting toilet setup. In the bathroom in the house they had a 5 gallon bucket with a toilet lid on it. I prefer a wooden box with a toilet seat, and you slide the bucket in. You put something on the bottom of the buck - leaves, leaf mould, sawdust from raw wood (NOT kiln dried lumber, the microrbes that eat poop are dead), even normal dirt - a layer. Then every time someone uses the bucket, they sprinkle a handful of whatever on the product, and when full, take outside (or if you have room you can build a s***ting parlor shed outside).
It’s a good idea to have a few buckets, because if each bucket sits for a while it starts composting in the bucket, put the lid on but not tight, leave a crack for air.
A compost bin can be made from any kind of lumber hanging around, pallets if available and chicken wire. About 4 or 5 feet tall. Pile of compost material next to it. Dump bucket into compost pile, shovel some more composting matieral on it, and walk off.
No smell at all, composts in a couple of months, can be used on fruit trees or if no one has hepatits or parasites, even on food crops.
The main thing is to have plenty of composting material on hand. If you have acrege it’s easy to scavange. The family I visited got the city to dump chipper shredded stuff on their driveway periodically. Works just fine.