Does the job; does not work with NZ water bottles
"The product does exactly what it says it does at a reasonable price. It is indeed lightweight and easy to pack. Keep in mind that despite it saying it can be fitted on top of water bottles, it can't in NZ; out standard water bottle openings are wider than America's. I recommend you buy a sauce bottle alongside it. The nozzle of the sauce bottle fits neatly in the water filter's intake hole and you can use the pressure generated by squeezing the bottle to force clean water out of the filter."