The last time, and first time, I had dehydrated eggs was in 95 when I was a boyscout at Philmont. There is a reason I haven't eaten them since. In 96, I moved to Seattle and went on a trip with a couple of friends. We made scrambled eggs and hashbrowns at home, then put them in vacuum sealed bags, and used boiling water to reheat them at camp. This was before I knew about freezer bag cooking.
You can also cook an egg in a plastic bag. Get a pot of boiling water, crack an egg into a freezerbag, squish it around to scramble it, then put the bag in the water. It will cook up nicely. Of course, do it at home first, to get the hang of it. I put seasoning in the bag as well (onions, pepper, etc).