Methyl Alcohol - CH3OH - Good solvent and a component of gasohol. Burned in top fuel eliminator dragsters and toy airplane engines. Lethal if consumed. Used to make methoxide in Biodiesel production. Methanol absorbs water from the air and only methanol which is known to be dry (anhydrous) or is 99.9% pure should be used in Biodiesel production.
i doubt model shops would sell it in 20L+ quantities
Pretty sure 20L will be no probs but the price will be hefty. Drag racers would have a supply source but no doubt you would need some sort of ANDRA licence to access it.