I've never used distilled water for my final rinse, though I can see the necessity if your regular water supply is really crappy. All the water I use for photographic purposes is filtered, and in my case It's probably not necessary to do that either but it makes me a bit more comfortable. Here's my recipe for the final rinse before hanging to dry:

PhotoFlo - 2.5 ml
Clear rubbing alcohol - 150 ml.
Water to make 1L

Give the film a short soak in this and hang it up to dry in a (realtively) dust free environment. No squeegee or fingers required, and the film dries cleanly.