I heard this from a member of my garden club. When the large refill bottles that are used in water machines crack, they are no longer of use to hold water. My friend goes to the water store and asks them for their damaged bottles which they give to him for free.
He then uses a Dremel to cut a line around the top, removing the top with the spout on it (the part that slips into the water cooler). Now he has a large cloche that can be put over plants in the garden as a mini cold frame. These freebies will accommodate large plants and are more versatile than the expensive, fancy glass ones you can buy.
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Repurposing Water Cooler Bottles