I made a very small whole in the side of the bator. Put small aquarium tubing thru it and layed it in the water tray . Layed paper towels rolled up in the tray and slipped the tubing in it. Each time I need ti add water I add warm to hot water with a syringe connected to the tubing on the outside of bator. You can buy the tubing(pet dept) and syring(pharmacy dept) at
walmart for a total of about $5.
I always recalibrate my hygrometor several days before a hatch. I keep 2 combination temp/hygrometor in the bator and always put new batteries in them before each hatch.
I elevate bator on 2 wood pieces so that it is 2 inches off the table. The holes in the bottom of the bator can then draw in fresh room air.(thats what there in the bottom for.
It does help keep temp evenly distributed throughout the bator if you have a circulating fan. Then you will not have eggs in cool spots.
I also keep a humidifier on in the room as it is very dry climate in Montana. I keep a thermostatically controlled portable heater that comes on and off as needed to keep the room at 70. Having room temperatures going up and down will effect the temp in bator and your hatch.
Sounds like a lot of work but it's not as I get it all set up ahead of time and during the incubation and hatch i don't have to bother with much.
There's nothing wrong with using a cheap styrifoam bator as long as you set up the proper conditions. With shipped eggs I usually get anywhere from a 60 % to 80% hatch rate.
I keep my hum at 30-35 first 18 days and 60% to 70% after that.
I candle day 11 and 18.
Hope your hatch does well.