A 34-year-old male farmer presents with frequent diarrhea and vomiting for 1 day (approximately 20 episodes, watery stools), accompanied by calf muscle cramps but no significant abdominal pain. Physical examination shows clear consciousness, signs of severe dehydration, BP 60/40 mmHg, plasma specific gravity 1.035, hematocrit 60%, WBC 18×10⁹/L, and stool microscopy reveals 0-2 WBC/HPF. Stool suspension and smear tests preliminarily diagnose paracholera. What is the correct management for the patient's family members and close contacts?