Hot answers tagged havdalah
Probably to ensure it's not Pagum. I.e.: If somebody already drank from that wine, it cannot be used for Kiddush or Havdala unless wine or water is added to it, as Paskened in Shulchan Aruch. סימן קפב - דין כוס ברכת המזון, ושלא יהא פגום ו: יְכוֹלִין לְתַקֵּן כּוֹס פָּגוּם עַל יְדֵי שֶׁיּוֹסִיפוּ מְעַט יַיִן, וַאֲפִלּוּ עַל יְדֵי שֶׁיּוֹסִיפוּ ...
As wine used to be much stronger than today, drinking wine undiluted was considered bad manners. Oppositely, whereas at the time, wine could be very diluted and still be considered wine, we fear that dilution will remove its status as wine. Therefore, we add a few drops to not drink it undiluted, but also not risk losing its status.
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