Should food and beverage outlets charge for water?

Local celebrity Joanne Peh recently had an unpleasant experience at restaurant chain Nando's when she was asked to pay S$3.90 for a glass of warm water. Should customers be made to pay for water at restaurants, regardless of price?
Update: More details on Joanne Peh's experience: http://sg.news.yahoo.com/blogs/singaporescene/joanne-peh-storms-restaurant-poor-050306850.html
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