I forgot my freeze distillation method:
1) cool your white vinegar down enough to where it becomes a slurry and filter it until you get maybe 1/3 of the initial volume
2) put the mixture in a jar and stand it upright in a freezer
3) once the mixture has frozen, tip the jar over and let it sit in the freezer like that for a day
4) a small pool of liquid should have formed, separate from the frozen fraction. pour that off into a separate container
the concentration of the final fraction depends on the temperature in the freezer. the temperature must be above -26.7°C for this to work.