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Vodka is made by the process of distillation of a fermented substance--often potatoes and rye or wheat grain--and less often, sugar beet molasses. Most vodka was traditionally made from potatoes and corn, but in recent years, most high-quality brands of vodka has been distilled from cereal grains.
Report Abuse. Each is made with totally different ingredients and the distilling process if completely different as well. Vodka is usually made from grains or potatoes. And cognac is actually a brandy that is produced in the region of cognac.It's history is quite interesting.n the other hand, Cognac is made from 3 types of grapes ugni blanche, folle blanche and colombard. The first grape is the most common in use and the most disease resistant. The last 2 are rare and used in limited amounts only.