[cythaenopsis]

I'm a bit of a pack rat (who has a project "shedding" going on, btw) and happened to have some thick spongy foam packing material on hand. I used a serrated knife and cut through it like bread, making a few rectangular shapes. I was able to stuff these into the container opening to block any insect traffic. Seems to be working, plus if the container overfills the water still leaks out.