I understand that it pays to store freshly ground coffee in the freezer. What about instant coffee or cheep prepacked Turkish coffee?
It's ok to store freshly grounded coffee or instant coffee in a freezer. Just consider to:
- Pack the coffee in a sealed package or container.
- Avoid keeping coffee with some other high fragrances items such as vanilla essence, rose water etc as these things can affect the main coffee essence.
Here is a source on How to Store coffee that has a clear explanation.