Here where I live, we have Argentinian Ants. These are small black ants that come in hoards. They love anything sugary. When I placed the bucket feeder atop my one hive, I knew there would be a problem eventually...and there has been. Since thehive sits on cinder blocks ( to keep the skunks away ), ther are no legs to place in water/oil...
I bought some inexpensive cinnamon and sprinkled it on the hive cover around the bucket lip, and around the base of the blocks...
It has worked! Worked well I might add...