OK you are probably good for now. The distilled will be for final rinse before you hang it up to dry, so you don't have minerals drying onto the surface. To the distilled water you might add a few drops of wetting agent (Photo-Flo if you can get it from a local camera shop. It's similar to dish soap, it will just allow water to sheet off the film without leaving spots) and/or some preservative that someone here may know of.