Douwe Egbert's coffee jars - airtight?

[Curlybrunette]

Hi,

I'm making some flavoured vodkas for Xmas and have saved some Douwe Egbert's coffee jars, do you think they would be ok to make the vodka in, are they airtight?

They seem it, and have the rubber seal thingy.

Also, how do I sterilise them, I don't have any Milton, is there an at home way (I did read about putting them in the oven but wasn't sure about the lid).

Thanks