How to homemade heating pad

Grab a small towel. Baby’s towels work fine

Pour hot water (almost boinling) in a basin or anything handy

Place the towel in the water

Use tongs to make sure all the towel is soaked

Drain the water

Get a regular plastic bag

Place the towel, stretched, inside the bag

Press the bag against the towel

Fold the bag so a part is left without folds (to place over aching part) and the other is just plastic folded

There you have it! Place over aching part (back, belly, etc.). Hope it is useful!