We pre-mix scrambled eggs into a 750ml bottle (empty water bottle). Use as needed. Throw bottle out when done.
I've only needed them to last a few days on my short little trips. And they always do.
Just make sure you shake them bottle up good before cooking.
You can also throw some pepers, and onions, stuff like that, then you've got pre-mixed omets.
You can buy the premixed, pre-bottled cartons of eggs, but people tell me their not to healthy.