I find adding water messes with the temp for a couple hours as long as it doesn't get too hot in there don't worry it will be ok I added a wet sponge on my last hatch to raise humidity on lockdown instead of adding more water and it didn't seem to mess with the temps as much so will probably do that again this time round. So exciting and nerve-wrecking once lockdown starts, good luck I have my fingers and toes crossed for you!