Thanks again Xplorer for the good advice. Will do a reccy on the way in to Jenolan and take some water to cache. I'm taking a Katadyn filter and some Aqua Mira...I also have a Grayl (fantastic btw) but it is heaviest option and I think I will have it covered with the other method. As we are doing the walk from Jenolan to Katoomba, we should be able to walk downhill with our water from Little Creek. We aren't doing to car shuffle but will catch the train back to Sydney. Luckily we have partners who will drive us there! We are not starting the walk until Sunday. I have a weather forecast predicting showers Sunday and another saying none on Sunday but on Monday...so who knows! That's the weather for you