Take along a can of Dinty Moore Stew or Campbell Chunky Soup. If you're going to carry water anyway, one can isn't going to be that much more weight. Cook it and add it to rice to add some more calories and carbs to it.
The stew is available available in a vacuum sealed plastic tray under the Hormel Compleats product line, if you don't want to pack the can in and out. There are some other really tasty meals in the Compleats line. If you've been hiking all day, you'll probably want more than one as a meal. They're not that big.