Good tasting and healthy with little to no prep is a tall order. Large volume prep and portioning out is a different story.
You are especially limited if you don't have easy access to refrigeration and a microwave.
I decided long ago that food was no longer going to be a form of entertainment or enjoyment...just fuel my goals.
Now many here would suggest that this mindset could lead to a tendency to "fall off the wagon" and I would agree with that. But I happen to love dry tuna and cottage cheese and steamed brocolli, so every day is a treat, even though it's unintended. When I'm hunting, or on a jobsite, I always have tuna, plastic forks, and a can opener in the truck.
I think you can easily figure out some tasty foods that fit in with the nutritional plan I'm sure you've spelled out for yourself, but you may very well need to accept that you'll need to prepare in volume and eat the same thing for a while, until the next batch of whatever is made.