You've seen us ranting about how awesome our .1 micron survival water filters are, but I'm going to be honest for a minute here and tell you that filter straws (no matter what brand you choose) cannot remove salt from water.
That means, if you're surrounded by nothing but salt water, you're going to need to do something that your store-bought water filter can't do. You're going to need to make a water still. The method we're showing uses distillation by evaporation.
How To Make a Solar Survival Still For Drinking Water
1. Cut off the bottom of your bottle
In the first step, use your cutting tool to cut off the bottom of your bottle.
Your can or cup will need to slide into the hole so the bigger your bottle is, the better.
2. Fold the bottom of the bottle in
Once you've cut the bottom of your bottle off, fold the bottom of the bottle back inside the opening.
This lip will be responsible for collecting the water evaporation.
3. Place bottle over your container
Now place your bottle over the can or container which is holding your contaminated water or salt water.
In the video example we're using black ink, just to show you that you can collect fresh water from even super murky water.
4. Place your solar survival still in the sun
Now let the sun work for you and good old evaporation will take care of the rest.
You'll know that your distiller works when you start to see condensation inside the bottle.
5. Collect and drink your water
Shake the condensation to the bottom of the bottle where it will collect in the folded area.
Then just open the bottle and pour your clean water into a cup or canteen.
As you can see, this is not a whole lot of water, but in a survival situation, it can save your butt, especially if you're stuck on the ocean surrounded by water you can't drink.
Be sure to check out last week's survival hacks.