I don't understand the "need" for things like those. What's wrong with a 99 cent gallon plastic jug of water, or a canteen? I am wary of things in little packages, because as they are designed to be thrown away after one use, they are so wasteful. All that plastic and mylar can't be wise use of resources, in fact it isn't, it is used once, and then it all goes to the landfill, or is burned. The manufacture of plastic produces toxins even when made of recycled materiaIs. I prefer more permanent, larger, reusable containers that last for years, like a good canteen for outdoor excursions or an even bigger water container like a five gallon plastic water can for indoors.
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The Bell Curve says ignorance is normal.