how do I make a hot water bottle?

how do I make a hot water bottle?

I have a pinched nerve in (of all places) my lower butt. Right now, it’s bothering me enought that it hurts to sit, but I have way too much homework to be in any other position.

How do I make a hot water bottle out of things I’m likely to find around my house? I’d go with the obvious zipper plastic baggie, but I’m sure the zipper would unzip as soon as I sat on it.

Edit: I stopped one google search too soon. I’m in the middle of converting an old dish rag into a rice hot pack.

New and Improved

New and Improved

Blooming Cactus

Blooming Cactus

Wandering in the yard tonight….

Wandering in the yard tonight….

Gift tags…

Gift tags…

New blooms

New blooms

Wrinkly leaves

Wrinkly leaves