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We covered the bottle with a sock, cloth, plastic wrap, and bubble wrap. Then we stuck temperature probe in it and put the bottle in the cold bucket of water.
Our starting temp was 39.4 degrees Celsius. We ended with the temp as 35.8 degrees Celsius. Even though the temp only dropped 3.6 degrees Celsius I think we could've added more insulation to the bottom half because only the bottom half was under water and we only added a small padding to make the temp stay the same. But, all round our insulator was pretty good at keeping the heat in.