Kimcha Davshuna on Pesach Haggadah, Barech, Pour Out Thy Wrath
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אבל כוס חמישי התירו שיש לו סמך מן הפסוק כנגד והבאתי אתכם ואם רצה לשתות מים ישתה.
Rabbi Mark Greenspan
Some permit a fifth cup of wine based on the verse in Exodus, "I will bring you to the land." If one wishes to drink water it is permissible.