Camco Drinking Water freshener is a Sodium Hypochlorite solution. That's right, its
chlorine bleach.
Bleach is basic (alkaline). ACV is Acidic. If whatever you have growing likes an acidic environment, adding a small amount of mild acid isn't going to help. Adding a good amount of something very basic (alkaline) may.
If whatever is growing likes alkaline environments, adding more bleach isn't likely to help. Adding a strong acid likely will.
And of course don't mix cleaning solutions, and do stuff in a well ventilated area, whatever you are doing.