Did Ruby Ranch to Spanish bottom on the Green about 6 weeks ago. Started with minimal water, pumped everything we needed. Had 2 2 liter dromedary bags, and 2 nalgenes. When we'd stop for the night, I'd turn a 20 liter dry bag inside out, and fill it with river water. Set it aside, filter in the AM. I wish I had remembered the alum powder, but it wasn't too bad. I used an MSR hyperflow, carried a spare filter, never used it. I like this filter for this type of stuff because it cleans pretty well by back flowing. I generally flushed it every time I filtered. Enjoy your trip!