Filtering your water is critical, if for no other reason than to make it drinkable.

While this method does not purify it of bacteria or parasites, it is one way of clearing silt and debris that virtually anyone can make.

In a survival situation, hydrating yourself is paramount to survival; without adequate water, you have about three days – tops – before you start really suffering from dehydration.

This type of filter, while not a purifier, is one way of enabling yourself to use whatever freshwater you find along your way.

What types of DIY filtration systems have you used? Tell us about them below.