At home: Combine TVP, rice, corn and taco seasoning in a 1-quart freezer bag. Place this bag and the tortillas in another bag or container.
On the trail: Boil 2 cups of water. Remove water from heat and immediately add to food mix, filling bag until water just barely covers food ingredients. Mix thoroughly, then seal the bag and let sit for 10 minutes. Stir the food contents and test the rice for softness. When rice is tender, spoon mixture into tortillas, add hot sauce or salsa, and enjoy.