Heat oven to 350°F. Lightly grease or line muffin pan with orange paper baking cups.
Stir together water, vegetable oil, eggs and muffin mix until moistened. Fill muffin cups 2/3 full.
Bake 14-16 minutes or until golden brown. Cool 5 minutes; gently loosen and remove from pan.
Whisk together 1 cup powdered sugar and milk until smooth. Separate 3-4 tablespoons of glaze into a small bowl. Add 1/4 cup powdered sugar and green food coloring and whisk until smooth. Transfer to a small bag and cut a bottom corner, so it’s ready to pipe. Set aside.
Add orange food coloring to the remaining glaze. Dip the top of each muffin into the glaze, then immediately into a bowl of orange sugar crystals. Transfer to a cooling rack to set. Repeat with remaining muffins.
Whisk 1/4 cup powdered sugar and more orange food coloring into what’s left of the glaze.
Transfer to a small bag and cut a bottom corner. Pipe 5-6 curved orange lines on top of each muffin. Place a small green candy in the middle where the lines intersect. Pipe curling green vines coming out from the center “stem.”
Transfer to a cooling rack to set. Store cooled muffins in tightly covered container.