Check grocery stores that make cakes. They go through a lot of frosting buckets that are 4 and 6 gallons and are food grade and have nice lids. They clean out easily and don't affect the syrup flavor. My local grocery goes through about 5 per week. You can also get fry oil jugs from just about anywhere. Our local Chinese restaurant goes through 10 of those per week. Little harder to clean but you won't have to use defoamers the first year you use them.