Note that while they are built well, they can be kind of a pain, they're over 18 inches tall so they probably won't fit in the fridge or under cabinets unless you get the travel size one. They also aren't ANSI or NSF certified, even though they claim to exceed the relevant ANSI and NSF standards, which just feels like a red flag to me, not to mention that people have had issues reproducing their claimed results. Their website is also pretty sketchy, it feels very prepper/truther-centric