Boil water 4L is a little more than a gallon so 2 pop bottles will be a gallon passed through the much smaller pan. The 1st pot I sterilized the pee cups. 2nd pot boiled water and then drop egg in boiling water it cracked in 2m. Then I poured the boiled water in my vegi broth. Put a raw egg with the cracked one to boil in the last pot.