Eggs in incubator and power is being switched off!!

My snake layed eggs 2 days ago and we have just been told that the power will be turned off next week for 5 or 6 hours. Any ideas how to keep the eggs warm and has anyone else experienced this and what was the outcome? First ever clutch so starting to panic. Thanks.

Fill up every bit of empty space you can in the incubator with containers of water (bottles, small food storage tubs, etc.). The thermal mass of the warmed water will hold the heat better than air and keep the incubator's interior from cooling off too quickly. The eggs will be ok for a few hours.

Thank you so much.