Avoid wrapping acidic or salty foods directly in foil; consider using glass or BPA-free containers instead. For longer storage, use foil with an airtight container or plastic wrap.

Use aluminum foil only if you don't have plastic wrap and limit the storage time to a couple of days. Overwrap with the aluminum foil or put a layer of plastic wrap on top of it for better sealing.

For even longer storage, particularly if you want to keep butter fresh for several months or up to a year, Vlatka recommends wrapping it tightly in foil or plastic wrap and then placing it in a ...