Just ride it out.
As an experiment I tried hatching eggs once without turning them at all.
It was a decidedly poor hatch but some did hatch so your odds are still better than mine.
Hope it works out for you!
Since I am not very familiar with your incubator I can't say for sure BUT I would think that as long as you fill per instructions that should be enough water for the three days of lockdown.
Let us know how it goes!