The thing I am really cheap about is using a piece of Trident gum for 24+ hours, then using about a teaspoon to gargle with after I brush my teeth. It’s all you really need,and then chew the gum for about 30 seconds on to freshen it up.
Now if you soaked the gum in the mouthwash overnight, you’d restore the flavor and get another full day out of it.
C’mon man, you gotta learn to be really cheap.