Well, thanks....however, I may have found an "in-store-stocked" solution. Since I don't intend to make more than a few baits for my personal use, an in-store item helps.
I already had a piece of 1x2 PVC trim from Lowes in my shop. It was hidden in the rafters.
I cut a 3-inch piece off and dropped it into a container of water. It floated....maybe better than a bobber! Lowes carries a number of different widths and lengths of Royal PVC. I'll experiment with the 4-foot length that I already own, and report back. Thanks for all of the help.