Mix all of the DRY ingredients plus the honey, except the pistachios, into a quart-sized freezer-safe Ziploc bag or a reusable silicone baggie.
At camp, heat water to boiling.
Pour oats into a bowl that comes equipped with a lid, scraping out the bits of honey, OR simply keep the oatmeal in the baggie, tucking it into a Hyperlite REpack pouch.
Pour the desired amount of boiling water into the oatmeal. Stir. Cover the bowl or seal the bag and pouch, letting the oatmeal "cook" for 2 minute.
Stir, top with pistachios, and eat!
Notes
The amount of water you need to add to your instant oats can depend on the brand and variety of instant oats you use! For my recipes I use Organic Sprouted Quick Oats by One Degree Organic Foods.