Moutwash ingredients: water, alcohol, sodium, chloride (I have shortened some names here). The chloride and alcohol seem to prevent bacteria from forming. It works in fine in small quantities, half a cap for a full tank. And good breath...
Sorry...
Active Ingredients: Contains: Thymol (0.064%), Eucalyptol (0.092%), Methyl Salicylate (0.060%), Menthol (0.042%)
Inactive Ingredients: Water, Alcohol (21.6%), Sorbitol Solution, Flavoring, Poloxamer 407, Benzoic Acid, Sodium Saccharin, Sodium Benzoate, FD&C Green 3
I am not putting that in my water tank. It forms crystals... I'll post pictures of my Listerine bottle by my sink in my bathroom if you like... Sodium Saccharin is a sweetner...
and who the hell knows what Sodium Benzoate is.