In small bowl, beat egg and water. Place 1 egg roll skin on work surface with one corner facing you. Brush 1/2-inch border of skin with egg mixture. Spoon about 1/4 cup avocado filling in middle. Fold corner facing you over filling, tucking point under. Fold in, and overlap right and left corners. Gently roll egg roll toward remaining corner, and press to seal. Repeat with remaining egg roll skins and filling.