I read somewhere that when you put water bottles in a cold frame, the Sun heats up the water during the day and releases the heat at night. Just wanted some insurance. I also covered it with plastic. Seems to have worked just fine.
What I decided to do was to make portable planters for now. I went to the dollar store and bought these laundry baskets for $.99 each.
Sometimes the ideas in my head do not work out like I see it in my head. But I have to try.