Plain white vinegar (White House or Heinz is best; get grain vinegar instead of the cheaper petroleum based stuff) just rubbed on the underarms makes good deodorant. It kills germs, dries, and doesn’t smell.
The frugal story I have is a bit yukky, but I think it tops most frugal stories. - My MIL fishes out the Fleet suppositories, rinses them off, and reuses them. She tends to strain at a gnat and swallow a camel about being frugal though. - The suppository story was a bit too much for me, just too much frugality I think. In all fairness, maybe that’s the only time I’m aware of her doing that; but stuff like that is her trademark.
Oops! Sorry. This is a MIL story, not a FIL story.