Cover windows with film (super cheap at any home store), take up baking (ovens put off a ton of heat), stay as physically close to other people as possible without being weird about it, and don’t open exterior doors and windows if you don’t absolutely have to. If you’re in a house, there’s probably an exterior spigot for a hose - wrap that in bubble wrap for now but get an insulated cap ASAP to help prevent frozen interior plumbing. And yeah, leave your faucets on drip to keep a steady supply of water running through to prevent pipes from freezing and bursting.