I'd mark on a stick or something where 1gallon is in your pot, start with like 1.5 gallons, and then be ready to add water if it goes below the mark during the boil.
Originally Posted by petey_c
"Lets say your local bar pours an American pint where 15% of the beer is missing due to headspace. Every 6.66 beers you drink you 'll have been missing 1 entire beer". 6.66 beers!. I wonder who's really responsible for the missing beers... I don't know, maybe Satan??!