Hi Rose, That’s a great question! I need to update the article with that information.
I just keep this stored on a shelf with other remedies, at room temperature.
Infused herbal vinegars like this one generally have a shelf life of at least one year.
(In contrast, if you infuse something like fresh berries for culinary use, then you’d keep that kind of infused vinegar in the fridge and use it within a couple months.)