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You can also make a hot water bottle REPLACEMENT with dry raw rice. I put it into a man's dress sock (tighter weave than a cotton sport sock) and just knot the ankle part. They work very well, and rice is cheap.
Oh, and when I finally DO replace the rice in a hot-sock (maybe a year later), I save the old rice to wash out the insides of drinking bottles. A few tablespoons of rice with water and soap, will add more scrubbing power when you shake the bottle.
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