Here’s yet another water bottle for your consideration. The Eau Good Water Bottle features a stick of ‘Binchotan’ active charcoal which purifies tap water for up to 6 months. The bottle is made from BPA-free plastic and has an indent to keep the charcoal in place (smart) while a cork stopper keeps the water fresh. There’s also a carry tag for convenience. There’s a short video below so you can see a little more of the shape/size/etc.
I haven’t found any US retailers yet, but please comment or email if you know of one.