I love using fresh Mozzarella whether I'm making a caprese salad or a homemade pizza, but I don't always use it all in one recipe. A lot of people are nervous about saving fresh mozzarella and how you can safely store it.
The best thing to do is only buy as much fresh mozzarella as you think you will need for a recipe or that you will be able to use in a few days. If you have some left over the best thing to do is store it in a small air tight container. I usually fill the container with tap water so that the mozzarella is covered and add a pinch of salt. It will keep like this in the refrigerator for a few days.