LifeStraw® filters are used all over the world and put to the test in some of the harshest conditions. They are also tested by independent labs and meet NSF/ANSI International standards.
Because water quality can change at any moment, the best advice we can provide is to research common waterborne diseases and contaminants in the specific area you will be traveling and evaluate whether you need a purifier that removes virus in addition to bacteria and parasites, or a microfilter which moves bacteria and parasites only.