Incubators and water

Do you guys/girls have open water in your incubators or is the humidity in the tubs enough?
Any opinion's would be great.

I place 2 liter bottles full of water but I dont have a open container because the condensation will have the whole incubator flooded

No open bottles in mine. I have water bottles in the door to help bring the temp up when I get in to check the eggs. The humidity in the tubs has been enough.