Preheat oven to 160C/320F.
Line a baking sheet with parchment paper.
Combine oats, sugar, cinnamon, salt, orange zest, honey and oil in a deep bowl; stir until thoroughly coated.
Place granola mixture on a baking sheet; roast for 30 minutes, until golden brown.
Remove from the oven and let cool completely.
Toss dark chocolate and cranberries into granola; mix well.
Divide granola into 4 equal portions; put them into separate, small-sized zip-lock freezer bags.
Add to each portion 2 tablespoons of powdered milk and seal the bags.
Pour granola into a bowl.
Add ½ cup of hot or cold water; stir well and enjoy!
Bring ½ cup water to a boil.
Carefully pour hot water into the bag with the granola mixture.
Stir well and enjoy!
