O.K....I think I know where you're going with this Hazel!
Can you see the smoke over there!?
The jelly container is 3.5" x 3.5". I have a couple of those ceramic melter things that you use for melting butter & dippin lobster. If I put the ceramic dish inside of the plastic container that's filled with water, it would be weighted down enough and wouldn't float off to the sides. Now I have to find the butter melters and experiment.
I think I'm going to make another batch of the old feeders like I made last year, with the base. I didn't have any ant problems with those ones.