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Distilled water is actually pretty awful for coffee, the water itself is not very good at extracting flavour.
also the idea that you can saturate the water with too many minerals and therefore not extract flavour is a fallacy, balance is the key.The bottled water test is fun, it's amazing how much difference it can make.
Matisse
lynx
The guys that did the talk at LMNH about coffee mentioned the tesco ashbeck water as a good one to use. If you wanted a nil residue you'd look at distilled or deionised water, hence my low residue comment.
Interesting points you make, firstly playing with different bottled waters and tap water there is a noticeable difference, have tried it on friends.