Best way to force carb 4 litres?

[admin]

I have 4 litres of cider in a demijohn that I'd like to force carb so I can drink it while the summer is here (finished this Wednesday).

Has anyone any suggestions on how to do this?

Putting it in a 19L corny will just waste stacks of CO2.

[Ciderhead]

Carbonator caps arrive next week

[Alex Lawes]

You could bring it up to me and we try the carb stone? Still loads of Co2 though. I think you're in soda stream territory though.