6. DIY Tampon Water Filter Straw
Remove the outer plastic case of the tampon carefully, and then cut the cotton down until it can be pulled into the inner tube. Once this has been completed, go ahead and cut off the string that will be hanging out of the narrow side.
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This will leave you with a water filtering straw that can be used in a last ditch emergency situation. Please note that this will not filter out all of the harmful contaminants, but it could keep you alive by giving you access to water that is not completely filthy. If possible, boil the water before you filter it through your DIY straw.