The root is a very good source of carbs. 100 grams of root contains about 26 grams of carbohydrate. This is about 20% of your daily requirement, so a couple of roots could be equal to about half of your daily carb requirement, which is certainly enough to keep your energy level up and your brain functioning properly.
Minerals include zinc, magnesium, copper, iron, manganese, and of potassium.
If you eat the leaves, which you should in a survival situation, you can add vitamin C (100 grams provide approximately 80% RDA), Phosphorus, Calcium, and trace amounts of Selenium and other minerals.
In sum, finding a patch of Taro in the wild would go a long way towards enjoying your involuntary camping trip.