Make own gas mask

transparent containers could work?

You're welcome

...I'm Canadian...

I thought that at first as well.

I correct myself, after some research I think that a sponge would work to some degree but integrating charcoal into the base of the mask would make it much more effective

This solution was designed as a quick and easy solution if you were faced with an immediate threat, not everyone has charcoal laying around. it allows you to get what you need while avoiding the worst of a chemical attack

That's true. I would also like to point out that you should definitely push the sponge all the way to the nozzle of the bottle