If you buy the large bottle of glycerine from Shoppers, you can use it for many bathroom rituals.
Glycerine is hygroscopic. It attracts water. This is why your mouth dries out when vaping. A drop in your palm can be applied when still wet from the shower for a great moisturizer. Mix 1 part with 10 parts water for homemade mouthwash (it also has anti bacterial properties)
Mix a drop with shaving soap and watch your lather explode.
You will quickly see that 500 ml goes very fast when used for more than vaping.