In case you get stranded in the middle of nowhere or end up in a third world country without drinkable water, you’ll need something like the iStraw. The iStraw Emergency Water Filter is essentially a polycarbonate straw that uses a micro-filter to clean the water as it travels up the straw and into your mouth. It is lightweight and easy to use (how hard can a straw be to use?).

$39.99 via ThinkGeek.

Features:
* Reduces up to 99.99999% of all waterborne bacteria, including Giardia and Cryptosporidium
* Filters up to 500 litres of water
* The iStraw can be used for local municiapal tap water, streams and lakes but always refer to the instructions
* The iStraw should not be used to filter brackish or turbid water and it does not remove chemical contaminants or viruses contained in water

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Via: Geeky Gadgets and ThinkGeek