There's a lot missing in that "kit". Two gallons of water is good and I get the comfort snacks angle, but my choice in nourishment would be significantly different. Water and food items are stored in an Igloo cooler to moderate temps (both warm and cold).

Rubber boots and a wool blanket; that's it? How about clothing for an extended stay (or long walk) outside the comfort of your heated car? Long underwear, wool socks, warm boots you can walk in and a parka...