I use filtered water in my backcountry "bidet," but only because I use a gravity filter and it's the easiest way to fill it.

I managed to convince my 2 girls, 12 and 15, to go paperless on a 5 day hike in Canyonland a couple of weeks ago. The 12-year-old did very well, and the 15-year-old just didn't go for 5 days. She hit the potty at the trailhead when we finished and was just fine!