For the source text click/tap here: Bava Batra 96
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The Gemara explains that according to the Chachamim, when one mixes wine sediments with water and later finds that the amount of water in the container is the same as the original amount, the beverage is exempt from Ma'aser. Since the amount of water in the mixture remained the same, the mixture has the status of water, and there is no obligation to separate Ma'aser from water. Rebbi Yehudah disagrees and states that Ma'aser must be separated from the beverage.
We explore the halachos of wine vs grape joice for kiddush and the the rabbinic response to Prohibition.