how to make new plugs/stoppers for wine bottles?

[burek]

Has anyone got any ideas/tips for stopping bottles? I have some wine bottles which I would like to use to keep cordials in over the coming months but the corks are long gone. I can't find anywhere here that sells just the corks, and in any case I would prefer to use something I may already have around the place. There's no glass recycling here btw so getting rid responsibly is not an option.

I once saw a dry corn kernel (without the corn) wrapped in plastic being used as a cork in Mexico... but don't have any of those handy sadly!