Preheat oven to 350 degrees. Grease and flour a 12-cup muffin tin.
In a large bowl, combine the flour, salt, baking soda and cinnamon. In a separate bowl, whisk together the eggs, water, sugar, oil and lemon juice. Stir the wet ingredients into the dry ingredients until combined. Fold in the grated zucchini and chocolate chunks.
Fill each muffin tin 2/3 of the way. Bake 30-35 minutes.