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Water in Italy was expensive and up to 2€ in the South from what I remember... In my place, water was free at the restaurant, and liek 0.15€/L in the supermarket (1-1.50 was the price of a pac of 6 bottles of 1.5L).
In Norway, I don't know but tap water is safe and doesn't taste bad at all - the quality is pretty good- so I never really checked the prices, around 1.5€ for a small bottle (0.5L). I wouldn't be surprised if it was more in a restaurant.