A 28-year-old woman from coastal West Bengal presents with 12 hours of profuse watery diarrhea and abdominal cramps. Stool culture grows Vibrio cholerae O1 (biotype El Tor, serotype Ogawa) susceptible to all first-line agents. She has been rehydrated with 2 liters of IV normal saline and is now hemodynamically stable with urine output restored. What is the most appropriate next step?

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