Whenever I'm thirsty, isolated and
Whenever I'm thirsty, isolated and in front of a random water source I have no longer doubts about the outcome.
Having a water purifier easy and efficient to use is a big deal.
My only regret is the absence of a solution to use the bottle without the filter, when water sources are reliable: for now I've used a circular piece of tight thick silicon at the top and it seems to hold well. It's easy enough to refill using the big cap. Also the capacity is now 1 full liter (even though a bit of water tends to stay inside the double wall)
Still didn't use it for cooking, or making coffee (I also bought the coffee press).