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Preheat oven to 375°F.
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Line 15x10x2 inch baking pan with a heavy piece of aluminum foil long enough to overhang the ends of the pan; butter the foil.
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Put the butter, white chocolate, and water in a heatproof container and place over simmering water.
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Stir the mixture until the chocolate and butter melt and mixture is smooth.
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Remove from hot water and set aside.
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Put the eggs in a large bowl and beat with an electric mixture just to blend.
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Add the sugar, salt, and vanilla.
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Beat at medium speed until thick and fluffy, about 2 minutes.
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Mix in melted white chocolate mixture.
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Add flour and stir just to incorporate it into batter.
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Mix in chocolate chips.
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Pour batter into foil-lined pan.
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Bake for 30 minutes.
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Cool brownies in pan.
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Cover the pan and chill the brownies until they are firm, about 6 hours or overnight.
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Use overhanging ends of aluminum foil to lift brownies out of pan.
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Remove foil and cut into 12-16 pieces.