We all know some ways to keep warm, but it helps to be reminded of others. The one on this list that is a bit iffy is making long underwear like an electric blanket. Do that at your own risk.
I’m adding a few here: make rice-filled “bean bags” to use as hand warmers. The rice-filled neck warmers are good too. You can make a nice neck warmer without rice by sewing a rectangle of fleece into a tube that will go around your neck. Make sure it can stretch to fit over your head. It acts as an extra scarf layer & is good for those who don’t want to wear a scarf. Also if you make meals in the oven or bake goodies in the oven the heat of the oven will go into the house for extra warmth. Quick breads and muffins work well for this. If you are knitting, the project will get bigger and keep your lap warmer as you knit: a good bonus.
If you use a space heater be sure to follow directions carefully and keep the kids away from them to prevent burns. Space heaters can cause fires, so be very careful where you put it.
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Hot drinks are definitely a good idea as are hot foods. Choose soups instead of salads sometimes.