No matter how clear and clean the water may look microscopic contaminants and lifeforms like bacteria and viruses could wreak your entire trip. If you are going somewhere that water safety is an issue we recommend always carrying a chemical purification option like Polar Pure or Potable Aqua. If you need water immediately or just don't like chemicals then check out great filters from MSR and Katadyn. If you're feeling high tech then look at Hydro Photon's Steri Pen line.
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