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Just to add to renormalised (hope you don't mind btw). David Jewitt, who discovered the Kuiper Belt in 1992, concluded more recently that the deuterium/hydrogen ratio of 3 large comets in the Kuiper belt does not match that of our oceans. The conclusion is that this is not the likely dominate origin of our water.
Very interestingly he and others at the University of Hawaii believe that Icy Asteroids between Mars and Jupiter were the likely cause. These asteroids are almost indistinguishable between comets. They exhibit a coma like appearance / tail that is believed to be water vapor.
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