"is there a technique by which I could use boiling water to cook my fish?"
Yes, poach chunks of fish in a soup base of your choice, either made from scratch or using a commercial one such as one of the Thai Kitchen varieties. Asian markets will have a wide variety of soup bases, too. When I was still fishing, I found soups to be the least difficult to clean up after, as well as simple and satisfying. Add noodles, and you've got protein and carbs in one simple dish. With the soup mixes, you will typically bring the water to a boil, add the spice packet(s) and fish, turn flame down to simmer, poach until about half done, and then add the noodles(if you are using them) and cook until everything is cooked. You can also substitute other carbs, like cous cous, pre cooked dehydrated rice, quinoa, etc, or even add instant mashed potatoes after the fish is fully cooked. Have fun playing around with it; it's a great way to enjoy fish in the mountains. It might even be a good idea to experiment at home with store bought fish until you get some sense of how long it takes to cook fish and noodles so you can time when to add each ingredient. Even so, there will be a learning curve at altitude because water boils at a lower temperature.