Defender graphene-filter water bottle purifies at the push of a button

Over the past decade+, we've seen many takes on the water filtration bottle, from full-blown modular ecosystems, to UV zapper tops, to French press-snug push filters, to squeezable bottle filters. Each one goes well beyond the typical fridge-stored Brita pitcher, deleting harmful microorganisms like bacteria, protozoa and, sometimes, viruses.