Does anyone have any experience with leftovers?  Particularly rice?  I am wondering what the shelf life is stored overnight in a food pack, inside of a small tupperware container.  I like the calorie to weight ratio in Vigo Beans and rice packages, but they are too much for me to eat in one sitting.  And, if I thought I could eat the second half of a package safely the next morning (cold), that would cut down on weight in my pack and keep me from having to cook in the morning.  

I thought about sinking the tupperware in a lake 5 or 6 feet down...but I'm not sure what to do.