The Air Up is unique in that it's designed to alter the natural taste of water, but not by flavoring ... such as hot pink, orange, blue and white. The plastic bottles are sold in 22-ounce sizes.

You can then add nitrogen gas to the bottle to flush out the air and oxygen. An interesting story to go along with this demonstration: The "Blue People of Troublesome Creek" were descended from a ...

two Air Up bottles and three packets of pods showed up on the doorstep. A colourful, blue plastic Gen 2 Express and a dark matte Steel Classic (both £35 at retail) are my choices (the Sipper model is ...