I like to boil water inside the tent (which heats it up) and make tang, or Gatorade...which are both good hot, when temps are cold.
Also, cup a noodles is good. I really like hot stuff when I get out of my bag. They are light, and all you need is water....but they are a tad bulky. Also, bowls of soup, I get them at my local dollar store and man do they hit the spot when it is cold. You know the kind, they either come in a little styrofoam cup, or a paper bowl.
Hot liquids go a long way when it is below 40 degrees.
John 14:6