Pour four gallons into the four-gallon bucket
from the 9 gallon bucket twice, leaving one gallon in the nine-gallon bucket. Empty the four gallon bucket.
Take it from there....
Pour one gallon into the 4 gallon bucket...
Fill the 9 gallon, and fill the 4 gallon (which already has 1 gallon) with 3 gallons, leaving 6 gallons in the big bucket...
Empty the 4 gallon, then fill it with the 6 gallons remaining in the large bucket, leaving 2 gallons in the 9 gallon bucket.
Blow a bone, crack a BEER... And start DRINKING !!!