There are portable devices ...
Published by Yoshimi Yoshida, Environmental Consultant at Yoshimi Yoshida Environmental Nutrition Consulting Service
There are portable devices you can take with you to treat polluted water. Please visit the site below - Their products have been used during the disasters / earthquake aftermath in the past (Sumatra ) USA Company MIOX. www.miox.com/ You can see that in Amazon here. http://www.amazon.com/MSR-Miox-Water-Purifier/dp/B003ZZSGWQ