I've got a Lifestraw in everybody's go-bag. I use a Katadyn hand pump type when I need any amount of water. I can pump a quart a minute with my Katagyn, The downside is the Katagyn is heavy, 2 pounds or more. I still throw some iodine pellets into my drinking water.
I had a really bad experience above Big Sir on a backpaking trip. The water out of a mountain stream put 15 people down for the count, 20 miles from nowhere. They all had to be evacuated. Thankfully I cooked my water.