Thanks Strap Hanger.
The same guy who used beer bottles for trestle, also used the cardboard inserts of toilet paper rolls on his temporary layout.
I don't know yet what he did with the cardboard toilet paper inserts. However, I just took out of my recycle bin a couple of those cardboard inserts, and painted them tan in color. When the paint dries, I will use them to hide my water bottle supports under my temporary elevated station.
I like the idea of using throw aways or common stuff around the house like coffee cans, coffee grinds, wooden coffee stirrers, toothpaste caps, bottles, toilet paper rolls, Popsicle Sticks, etc., to make scenery and structures on a layout. The price is right because it's usually free.