How to make a homemade incubator for reptile eggs?

the best way i figured out how to do it was get an old fish aquarium and put regualr bricks in it and put enough water to cover the bricks then get a aquarium water heater and place it in the water for the eggs take a container really doesnt matter how big and using vermiculite which you can find at your local nursery or walmart fill the container half way and on the sides of the container poke holes place the eggs i it then put the top on it place the container on the bricks turn the heater on to as high as it will go than cover the aquarium as good as you can i used aluminum foil that worked best for me oh and make sure you watch your temp it should be around 90 95 degrees the humidity from the water will keep the eggs moist so u dnt have to wet them hope that helps