I would just cap air. All day long!
You’re bubbling with excitement over your special home brew of beer or soda, but there is no better way to top it off than with this easy-to-use bottle capper. The leverage created by the special two-handed design allows you, with little effort, to seal a metal cap onto your bottles for fermentation or transport. Comes with 50 caps, and works with any non-twist-off glass bottle, new or re-used.
More info: Beer Bottle Capper