No haven’t tried those but looking into these: http://www.amazon.com/Vestergaard-Frandsen-527950-LifeStraw-Personal-Filter/dp/B006QF3TW4/ref=sr_1_1?ie=UTF8&qid=1383622291&sr=8-1&keywords=clean+water+device
I have a LifeStraw. Love it.