I will tell you 2 ways to store feta so that its taste does not deteriorate. The first, ancient Greek method storing feta in olive oil, this has been done for centuries in Hellas. Take a container with a lid, put feta in it and fill it with extra virgin olive oil so that the oil covers the cheese, and close the lid tightly. Oil acts as a preservative, feta does not dry out, and even vice versa, over time it acquires a more saturated, slightly spicy flavour. It is better to store feta this way if you plan to use it for salads. The second option, take the container, put feta in it, pour it with milk with a high percentage of fat and close the lid tightly. Feta will become even more tender and slightly less salty.