Preheat oven to 375F
In a bowl, combine two beaten eggs, ricotta, 2 cups of mozzarella, and parmesan. Add spices as desired (see note) and mix well. Add water until the mixture is a bit flowy - you don't want it liquidy, but you want it pretty loose and spreadable. I'd add about 1/4 cup at a time and see how it goes
In a 9 x 13 inch pan, spread 1 cup of sauce on the bottom. Layer 4 uncooked lasagna noodles (they'll overlap, that's fine), 1/3 of the ricotta mixture, if using meat - add half, 1 cup mozzarella, and 1 cup sauce
Layer 4 uncooked noodles, 1/3 of the ricotta mixture, and 1.5 cups sauce
Layer 4 uncooked noodles, remaining ricotta mixture, remaining meat if using, and 1 cup of sauce
For the top layer, put 4 noodles, remaining sauce, and remaining 1 cup mozzarella (or add a bit extra to make it super cheesy!)
Bake covered with foil for 50 - 60 minutes
Uncover and continue cooking (or broiling) for 5 minutes, until the cheese on top gets a bit brown and bubbly
Let stand 15 minutes before serving