Mary used to mix up her oil-and-vinegar dressing using a measuring cup, then she drew markings on the bottle, then I added tidy labels:

The labels align with her process: she adds ½ C oil first, then ¼ C vinegar, then various other ingredients. The liquids swirl around, sort themselves out, and it’s all good.
Surprisingly, the labels survived uncounted dishwasher adventures.
They sound like good labels. Wonder what will happen once oil gets to them? You could go with a calibrated story stick if the labels fail.
The label on the Forester’s back window has started to bubble a bit, but it’s in much better shape than I expected.
And it’s a knockoff brand from the usual Amazon Bizarre supplier!