"..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?
Bacpac, to answer your question directly.
At first glance, the concept of carrying untreated water to be used with a filtration straw at a later time, seems sound. However I can give you a real life scneario which occurred over the May long weekend that illustrates why carrying clean, treated water is a better idea in terms of time saved and ease of use.
We were hiking with another couple and our female friend slipped and took a bit of a tumble on some wet, off canter ground. She went down and although she did not receive any serious injuries, her left hand took a jagged cut from the protruding rocks.
We had to first use our carried, bottled water to wash away the mud and debris from her hand before the cut could actually be treated which only took a few minutes after. Had we not been carrying clean, treated water and had to use potentailly contaminated water to clean around the cut, the risk of infection increases which could of ended a planned 3 day hike. Had we not had available treated water, yes we could of brought out the stove then boiled and heated the water then waited for it too cool a bit so that it could be used, however by having treated water always available (when possible) makes more sense.
I am not against using these types of straws, however people need to be aware that depending on these alone may not always be the wisest choice and when it comes to water, having available amounts and redundant plans in place is vitally important.