Often the water you need is not accessible, 20 feet below a bridge, down steep, unstable or muddy banks, or locked up in fearsome nettles and embramblements. So it helps to be ready to gather it from afar by lowering your water bag into it, with pole or rope. Here's one way using the CNOC Vecto 2L bag, this one fit with Katadyn BeFree filter cartridge.
Forgive my old man grunting as I crouch, please. Was last day of a 60-miler, first season hike, and I felt it!