Water treatment: Chemical

Household Bleach and Iodine are effective water purifiers, as a matter of fact most all of our city water systems are purified by Chlorine. These items are fairly cheap and you can purchase in bulk. You can also buy water purification tablets in Chlorine and Iodine to take out the guesswork, but are pretty expensive.

Household Bleach 
Use two drops of household bleach for each quart of water treated. Use an extra drop if extremely cold.


Iodine
Use 5 drops of iodine per quart of water.


After mixing allow water to sit for 45 mins-1 hour. The longer you allow to sit the more micros it will kill...if your able to allow to sit overnight do so.


This is by far the easiest method to purify water. Especially in a combat environment or in a survival situation where you may not have enough fuel to boil water.