I have 8 chicks, and use 2 round waterers with pint mason jars..... Have to replenish and clean daily. I fill jars to the top in the morning and by evening they only have about 1/2 to 1" water left and the bowl is nasty. I'm sure there is a lot of evaperation do to the high temps in the brooder (around 90 degrees). I have the larger gal size but going to use that in the chix tractor when they are big enough.
I also use the round mason jar feeders ( pint jar) and thinking of changing to the long feeder with the swinging bar on the top. They like to sit on top of everything and they are only 10 days old.