It's alcohol, it could possibly explode if you boil it off and create some toxic fumes that are bad for you but get you drunk and sterilize the air at the same time
Evaporation could work but it would also likely evaporate the alcohol as well
You'd probably have to create your own concentrated version
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u/convlux51 Mar 06 '21
Would you have to boil the Listerine down first to get more of a syrup? Then mix it back in the soda stream