If you don't mind looking like you're smoking on some kind of high-tech water pipe, the iStraw can filter all kinds of creepy crawlies out of whatever that is you're drinking. This little magic wand can keep away even the tiniest microbes, including that dreaded cryptosporidium bug. Its maker says it "reduces up to 99.99999% of all waterborne bacteria," but what about that other millionth of a percent? Anyway, the thing lasts a long time, filtering 500 liters of water before you need to replace its cartridge. Best of all, you can easily take it with you wherever you may roam.

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