Baking soda is a base, vinegar is an acid.
The former kills the burn if you get cayenne pepper in your eye, so dollars to doughnuts vinegar isn't going to help.
1.57 inches. Larger openings will make it easier to shove a very hot cannister in the hole. Thick gloves and plenty of room to shove that thing in a container are key. DO NOT handle without good gloves.
40mm is 1.57”. I would definitely do at least 2” to account for adrenaline interfering with the precision needed to quickly get a hot potato into a bottle of water.
Yeah, probably, but you can also create an exploding bottle if you aren't careful. That cannister is burning fuel to disperse the CS powder into the air, so it will create a LOT of pressure inside of a sealed container until the heat source is extinguished.
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The former kills the burn if you get cayenne pepper in your eye, so dollars to doughnuts vinegar isn't going to help.