Crank the Sidewinder to activate a built-in UV light that will give way to potable water. ... utilizes a crank-powered bacteria-killing UV light to create a full liter of perfectly potable water.

San Francisco-based water treatment company Epic Cleantec made a beer using water recycled from a luxury apartment building.

Then we put the water [from both streams, separately,] through UV [ultraviolet] irradiation with oxidation. We dose the water with peroxide before exposing it to UV light.

The O-Pen weighs just over an ounce (30 g) and purifies 16 oz (0.5L) of water in less than a minute. You simply drop the tip into the water, turn it on and let it do its thing.

The Los Angeles City Council took steps to ensure safe potable drinking water for the city after two water sources within the San Fernando Valley tested positive for contaminants last year.