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The recommended amount of water per person per day in a disaster shelter is typically around 3-6 gallons. This recommendation takes into account not only drinking water but also water needed for basic hygiene and sanitation purposes. In emergency situations, it is essential to ensure that people have enough water to stay hydrated as well as to maintain sanitary conditions, which can help prevent the spread of illness.

The figure of 3-6 gallons allows enough flexibility for various needs that arise during a disaster situation. Adequate hydration supports health and well-being, especially in stressful environments, while having additional water available for sanitation needs is critical in maintaining hygiene and preventing contamination.

Thus, the selection of 3-6 gallons aligns well with emergency preparedness guidelines that emphasize the importance of sufficient water for both consumption and sanitation in a disaster shelter setting.