I like the Olive oil idea but I've been trying to track down some Ghee for just that purpose...as well as for the camping pantry.

One of the things I struggle with when it comes to gear is that I love multitaskers. With the extra stuff I'd need to carry out this crazy idea that started this thread, I want as many multi taskers as I can to keep weight down. I also want some overlap/redundancy because re-supply can't be counted on which suits multitaskers fine...usually.

The Millbank bag is a neat idea and would be nice to have but it won't produce potable water on it's own and even with chemical treatment Crypto can still be a problem which is really what's critical...I'll stay dirty a long time if it means I have fresh drinking water. To me that makes it a bit of a liability weight and space wise.

I'm currently trying to get some multitasking out of my hydration bladder (Source 3L) by seeing if I can't adapt it to be a shower of sorts or at least a good washing aid. I'd also like an inline filter for it but before I'll use any kind of filter for this setting it needs to be backflushable or have a really long service/replacement interval. I forsee some creative bladder plumbing in my future for that.