"..although you can safely drink through the straw as needed. it does you no good if you need to travel with water stored in bottles. Whereas other treatment methods allow you to treat water as needed and also that treated water then can be stored in bottles and taken with you and used where there may be no other replenishable water."

I've been thinking about this exact thing lately, Teslinhiker. Is there any reason why you couldn't take a container full of untreated water with you and use the filter straw when you want a sip? I've never heard of anyone doing that and it's always been pointed put as a downfall of this type of product.

Could it be that bacteria and virus might build up in a concentrated space like a water bottle?