As your resident expert on preppers.......
How much Activated Charcoal do you have in your Preps?
RE
I have a deep, clear, house well.
I have a spring fed surface well.
I have roof catchment.
I have two ponds that we dug.
There is a LARGE cattail filled pond at the edge of our property.
We have hundreds of liters of our own water stored in the back room.
40 litres of distilled water for the solar batteries.
About 80 ltrs of juice.
A local milk source.
Bleach.
Crystallized bleach
40 ltrs water heated near boiling point on the wood fired stove as I type.
Any questions?
So no Activated Charcoal? 
Question: What good will all those other Preps do you when your corpse is pushing up daisies after inhaling COVID-19? 
RE
I see everybody has been busy shouting at each other.
Ah. I see. You were thinking gas mask. As NF pointed out, a virus is not a gas, thus a charcoal filter is as useless as a gas mask, thus I never gave it consideration to your random attack for no purpose.
It's main use would be water filtration... of which, I have no need for charcoal.
The only reason I would recommend it would be to block up lethal diarrhea. It's other use.
I wonder if that comment was too subtle.

I have a very good filter. A kilometer to the nearest neighbor.
I spent the day, up on the new ladder cutting black knot out of our sour cherry trees. I had to save the trees if I want to continue to have that food source. Then I drained and cut up an abandoned oil tank on the property to build a mobile fire pit. Something that wont start a grass fire. Then I burned the black knot infested branches so it doesnt re-enter the soil and spread again.
The job took a lot more of my day than intended. But that's permiculture and building food security. Cut forest logs to raise the garden beds the days before.
Tomorrow, I'll cut a lid for the mobile fire pit so I can walk away from the fire instead of having to monitor the embers if the wind kicks up, then get to modifying my flat deck trainer to a box so I can hall in a load of cow manure from a friends place.
My brain is a bit to fuzzy tonight to reply to the, "The virus was an inside job" video.
My only comment was about how I seem to recall a lot of that response after 9-11. I expected to see a lot of that, this disaster.
Something to keep in mind. Every virus expert on the face of the planet will has been and will be studying and dissecting every part of this virus. Every genome.
It would be all over the news by now if it was observed to be man made. Had the same arguments after 9-11 about how the building were supposedly blown up by a sinister cabal of globalists... and global warming isn't happening because its sun spots.