EDIT: Bwiset! Some FUBAR in the "CATEGORIES" got this entry re-posted again. Oh well . . .
Ang tubig ay buhay.
This is one functionally cool and handy gadget for that most essential element of life. It only takes a very short while to get dehydrated and after three days without any of it, you die!
I can think of innumerable ways this could prove useful and convenient, such as for tourists bound for locations where the facilities or amenities might range from sub-standard to non-existent or soldiers out in the field or even those whose jobs assign them to remote areas. Let's also not forget that in this disaster-prone country of ours, you may not always have the time or resources to boil your water immediately and chemical purification tablets often have an unpleasant aftertaste. The neat thing is that it uses UV (ultraviolet) light to kill those nasty microbes.
As it says though on the final part, it does not filter out "floaters" or the bigger stuff in the water. You have to first decant (pouring the water slowly so that the sediments settle down the container and get left behind) and then filter it by improvising any cloth material at hand.
It comes in different models. I spotted one on ebay.ph!