nan3062516 wrote an answer about MSR SweetWater Purifier Solution Replacement Bottle on April 28, 2009
Plain Clorox for water purification: 2 drops per quart, 8 drops per gallon. Let sit for 30 minutes. Cloudy water; double dose. Water should have faint bleach smell. If not, redo.
Pure Clorox is corrosive and must be handled with great care.
If could really ruin your backpack and everything in it.