I write the recipe right on the bottle with a permanent marker. I have the inch measurements drawn on the bottle, and add Stay-Flo starch to the right measurement, then add water to dilute it for spraying. Usually it is one inch of Stay-Flo and add water to the 5 inch mark. So easy.
If you write your recipe for the Vodka starch on the bottle, it will always be there. (sometimes I have to "refresh it" with more permanent marker, but I do that before it is entirely worn off.)