Bleach is useful for making water safe to drink without the use of fire. This may sound dangerous as obviously drinking bleach generally isn’t a great idea, but it’s actually not dangerous when it is highly diluted and not done for an extremely extended time period. It will however destroy anything harmful in the water.
To purify water with bleach you need clean the sediment from the water using some kind of water filtration set up. I’m sure most of you will know how to do this with an upturned bottle and layering up some filter media and I described this in the last chapter briefly so I won’t go into that again. Then once your water is free of sediment, add 4 drops of bleach per liter of warm water and leave it to sit for half an hour. If you can’t warm your water in any way then just double the dose but it will taste quite bleachy.
Iodine can also be used in the same way and it’s safer for human consumption than bleach. Side note, it is recommended that you don’t use Iodine for water purification for longer 6 months straight. For those of you worried about a nuclear disaster, Iodine is also absorbed by your thyroid and will protect it against radiation, bonus!
If you don’t like the taste of Iodine you can keep an eye out for some vitamin C tablets on your scavenging missions as they will neutralize the Iodine and make your water taste a lot better.