I use Hermes via www.parcel2go.com
But you can use Royal Mail, Collect Plus, UPS, DHL, InPost, DX, Parcel Force or any company which fits your budged and convenience.
Please declare the content as aluminium bottle or metal flask.
CO2 / Sodastream cylinders are not allowed with most carriers, but your bottle is empty and therefore safe!
Please don’t forget to put your name on bottle and parcel!