One thing you can do is use bubble wrap to fill any gaps in your underneath your doors.  You can also apply bubblewrap to windows to insulate the heat.  Make sure your vents are not blocked with items.
For those without a home, there are lots of places to donate your socks, hats, mittens, scarfs, sweatshirts and blankets.  Google your neighborhood donation drop off.  Today Sarasota had a drop off behind the rent a car place on US 301.
Local business’s in your area have campaigns such as warm feet donations:
http://www.infinitiaesthetics.com/warm-feet-campaign.html