Here's my homemade ant-moat, which so far has kept most of the ants off the hummingbird feeder. I say most, because somehow a couple have gotten through, but that's okay.
Unless the "Moses Of The Ants" comes and parts this sea of tap-water, I forsee no further ant problems.
1. Wire from an old clothes hanger
1. Mott's applesauce cup
1. Dab of caulking around hole