Hellrider,
You miss the point. Jesus' use of story does not mean he is teaching the doctrine that they had, it means only that he was using the story to illustrate something in his parable. You seem to have this false idea that a parable must be based upon reality, which simply is not true. One cannot ignore that this text is not speaking of departed souls, but only whole people, able to drink, able to feel physical pain, etc. The parable, if you watch the context, is speaking of "the rich" and those "who God helps." Who, in context, are these? According to the context, what changed that would correlate to their deaths? And, if you continue reading, what is ever so tiny that one could relate to only a drop of water? If you can answer these questions, reading Luke 15-17, you'll understand the parable perfectly and you'll see how it has nothing to do with teaching of a reality and is merely language that his audience knew so to make it easy for him to relate the lesson.
Now you ask a number of questions about if Jesus did the same thing in other places, and of course he didn't have to! We know 1) that this is based upon a preexisting tradition and 2) Jesus borrowed the language of the tradition and adapted it for his own purposes. He doesn't have to have done this more than once for him to have done it here. The fact that you have issue with taking the figures as symbols or representations of things defined in the context only demonstrates that you have not carefully studied the context!