The issue of limited quantities of natural cork and the problem of corking, when the wine takes on a corked taste, are leading to the increasingly widespread use of silicon corks and screw tops.

Get yourself a few screw-top or Kilner-type jars, making sure the tops don't have any exposed metal that will react with the vinegar (plastic tops are perfect - provided they seal properly).

Food containers that are not waterproof, they say, include those with screw caps, snap LIDS, pull tops and crimped caps.