I did not add the water into the bag prior to freezing it. I put add two cups of water on the bag prior to filling it. I did this because I didn't want to freeze water.
Combine all the ingredients except the water and the gruyere in a small bag to freeze with the crockpot mac in a freezer size gallon bag without the water.
Ready to use it thaw it in the refrigerator overnight
Place it in the crockpot for 3 hours on Low