It sounds like you are making this harder than it is and especially in a bug out scenario who wants to haul around a 5 foot piece of pipe.With grad school winding down for the semester, I'm starting to get some creative ideas for prepping. It dawned on me that maybe this could be a good prep forum.
My biggest idea is to create a portable water catchment system. I am considering taking like a 4-5foot section of 4" PVC, cutting a small slot (quarter inch or so) in it the entire length, and then finding a way to fix the edge of a tarp inside the slot. The pipe could be set on the ground, and the top edges secured to trees or other uprights.
This design clearly wouldn't be needed if you prepare your BOL adequately for rain collecting, but in the event of traveling to your BOL, it might be a viable source of water if you aren't near a ground source of it or run out of stores that you carry. Even if it doesn't rain, it would make a pretty good impromptu tent to sleep under at night.
Does anyone else have any ideas?
I may not be understanding your premise but how does it differ from this?
Getting Started In Emergency Preparedness: Expedient Water Collection, One Method