A few years ago I got introduced to using rubbing alcohol to remove arm pit odor, instead of the various other deodorants available in the stores. It has the advantage of not leaving any white deodorant stains, it is also a general anti-septic, and cleaner for some things.
I finally got around to painting the spray bottle I keep my rubbing alcohol in, there is a clear sight on the side to tell the remaining level in the bottle. The colors were chosen to indicate a good (green), worth refilling (yellow), and low (red) level.
The bottle may even last longer than the old one because of the extra layer of protection on it.