Heat oven to 350 degrees F. Place tortillas in a large covered casserole (or wrap them tightly in aluminum foil) and warm in the oven.
In a large mixing bowl, lightly beat together eggs, jalapeno and water. Add salt and freshly ground pepper to taste. Melt butter in a large nonstick skillet over medium heat. Cook eggs, stirring, until done.
To assemble burritos, place a tortilla on a cutting board. Spread a quarter of the scrambled eggs across center of tortilla and top with a quarter of the cheese, beans, scallions, cilantro, salsa, sour cream (if using) and lettuce. Fold the tortilla envelope style: bring one side of tortilla just over edge of filling, fold in sides of tortilla, then roll it up to form a tight bundle. Cut in half crosswise. Repeat with remaining tortillas and fillings. Serve burritos with additional salsa and sour cream.
* Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.