Easy Lasagna

I've only made this once before but it turned out pretty good.

1 lb ground beef
1 jar spaghetti sauce
1 1/2 cups water
1 small container ricotta cheese
3 cups mozzarella
1 egg
1/2 cup Parmesan cheese
12 lasagna noodles

Brown beef, drain. Add sauce and water and simmer 10 minutes. Combine all other ingredients except lasagna noodles. Pour 1 cup sauce on bottom of 9 x 13 pan. Make 1 layer of noodles and cover with sauce. Spread 1/2 of filling over sauce. Repeat layer of noodles, sauce and filling. Top with layer of noodles and remaining sauce. Cover with foil and bake at 350 degrees for 50-60 minutes. Remove foil and cook 10 more minutes.