Add water to eggs according to package. Cook small quantity at a time in bottom of pot with butter. Stir often. (Or use precooked freeze dried eggs, following directions on package.) Grate cheese. Mix salsa according to package directions. Heat tortillas in pot bottom or on lid over low heat with a little butter or margarine. Serve small spoonful of egg in tortilla. Add cheese, salsa. (You can also include a small quantity of instant refried beans, reconstituted with hot water, following package directions.)