Add Crude Glycerol as a product produced by mixing Yeast, something sugary item (e.g. Sugar/Honeyed Apple) and a water-sulfite solution (I think that's how it works). The Crude Glycerol can then be purified through centrifugatio, destillation or other means to yield Glycerol.

I think glycerol can be make by reacting Sodium Hydroxide and some animal fat, such as Porkschop, to make it via the saponification process!