I think I need to pull out the mending basket… and the spare blankets.
If you don’t have an electric blanket or a hot water bottle absolutely get one, it’s really efficient to have a small heat source underneath blankets to trap it. (For a hot water bottle wrap it up to prolong the heat and avoid giving yourself chilblains.)
For little kids that you don’t want to take the scalding risk with try a wheat bag.
In a pinch you can fill a sock with rice and microwave it for a minute. It will be small but better than nothing.
Just avoid burning the rice/wheatbag. Give it another 30 seconds to a minute if you really have to but take it out after the first minute, feel it and shake the filling around before putting it back. Also consider occasionally microwaving it with a mug of water to maintain the moisture in the grains. And putting it on the edge of the turntable so it gets more of a distribution of the radiation. You really don’t want to burn the rice by microwaving it too long, letting hotspots form or having it too dry.
Also you may want to insulate your windows.
Bubble wrap works for large windows - or for windows that are narrow enough you can buy cheap tension rods as temporary curtain rods to hang blankets in the window frame behind the existing curtains or blinds. (This is also a great solution to preventing drafts from doors you don’t want to close, ie pets need to randomly access the next room for their litterbox). Check eBay or IKEA.
Thick Italian style hot chocolate
may be made by cooking milk with cornflour and cheap chocolate (or sugar and cocoa). Just be mindful that milk burns very easily on the stove and don’t leave it unattended for even a second. You might also want to mix the cornstarch with milk and add it as a slurry to avoid lumps, and sift the cocoa.
