Heat a large skillet over medium-high heat. Crumble the ground beef and sausage into the skillet and cook until no longer pink, breaking up with a spatula as it cooks. Drain as much grease as possible.
Pour one jar of sauce into a 6-quart slow cooker.
Add the meat on top of the sauce.
Pour the remaining sauce over the meat, then pour in the water. Sprinkle the basil, oregano, parsley, garlic powder and onion powder over the top. No need to stir.
Place the noodles on top, gently pushing them down so they are covered with liquid.
Cover and cook on LOW for 2 1/2-hours, stirring the noodles gently about halfway through to make sure they aren’t sticking together.
Check for doneness - the noodles should be soft and most of the liquid should be absorbed.
Notes
Don't skip cooking the meat.Store leftovers in the fridge for up to 4 days.While you technically can freeze this spaghetti, I don't recommend it. Because the noodles are cooked in the sauce, the texture may get a little mushy as it thaws.