Here is what I currently use, along with, or instead of the sawyer squeeze mini.
This for backcountry springs and streams.

Liquid 2% Tincture of Iodine Add 5 drops per quart when the water is clear. Add 10 drops per quart when the water is cloudy. wait at least 30 minutes.

http://www.princeton.edu/~oa/manual/water.shtml