I used 'pizza mozzarella' (which comes in a block) rather than fresh mozzarella (which comes in a ball, in water). Pizza mozzarella is less wet, so you'll end up with a richer, less watery pasta bake. You can use fresh mozzarella if that's all you can get, but it may end up a little wetter. Grated mozzarella would also be fine!
Nutritional information is approximate, and will depend on your exact ingredients. Please calculate your own nutritional values if you require accuracy for health reasons.