Vinegar/acetic acid (any % H2O) is placed into a distillation setup and castor oil is added to the soln.
The mixture is rotationally stirred to prevent the oil layer from being broken.
Pure acetic acid will distill over as glacial acetic acid is miscible with castor oil, however, water is not, therefore differentiating the contents via miscibility. (Consider using a drying tube to make sure it's dry. Water in the air above the tube may slightly reduce the purity of the acetic acid.)
Btw, castor oil is also miscible with alcohol, so this technique can be applied with ethanol to get anhydrous ethanol.
Benefits: Cheap. Easy. OTC. No fancy gear needed. If a stirring apparatus cannot be implemented into the oil, one could mix the oil and vinegar/AA, seperate the oil and distill the AA out of the oil directly. Anyone care to find faults?