The broilers survived the freezing temps last night. Someone gave me some left over insulation from a project(the kind with the hard back) and I was able to place that on top of the comforters and blankets that I have draped over their brooder. It definitely kept the warmth in. Temps in the brooder with the insulation on top was 65 degrees as opposed to 45 - 55 degrees without the insulation. This confirms my idea of having an insulated brooder if I decide to raise broilers in the winter months again.
The water consumption has slightly changed within the last day. I filled all (5) gallon waterers up on Tuesday evening. I checked on their water on last night (Wednesday evening) and 3 of the gallon waterers were EMPTY and 2 of the gallon waterers had 1/4 water remaining. So they are drinking more and more water. So the 5 gallons of water being gone in 2 days has changed to 5 gallons of water almost being gone in 24 hours. I will see where their water level is today when I return home from work.
When I filled up their feeders (20 lbs of feed) yesterday evening, it was gone within 30 minutes.