KatadynGravity BeFree 6L Water Microfilter, Camping, Backpacking, Emergency Preparedness, Blue

Easy to fill, though if there was a handle that you could attach to reach further from the river bank or shore. That would keep your feet dry. Filtered water from several sources, river, pond and Lake Superior. Worked flawlessly and quickly for three people over a 4 day Hike, everyone stayed healthy, no residual effect at all.