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I was able to put in 35-40 more 2-liter bottles into my polytunnel today. Now, most of the ground inside is covered in containers of water. I'll be picking up a few buckets of super cheap black paint this week and getting more containers for water. I'll be able to paint the new ones, let them cure completely then swap them with bottles already inside. From there I paint those and swap; repeated until all are painted black.
The temperatures inside are doing pretty well. I checked the plants and they are still setting fruit and making new flowers.