Combine the ground beef, onion, celery, zucchini, garlic, bacon, diced tomatoes, tomato paste, water, and Italian seasoning in a large resealable freezer bag.
Squeeze the bag to mix all the ingredients together.
Remove excess air from the bag, seal it, and place the sauce ingredients in the freezer until the day of cooking.
Cooking instructions:
Transfer the Bolognese to the refrigerator to thaw overnight.
Pour all the ingredients into the bowl of your slow cooker and set to cook on low for 4 to 5 hours or simmer on the stovetop for 25 minutes.
Serve the cooked sauce over spaghetti, spaghetti squash, or zucchini noodles.