Cut each mozzarella string cheese stick in half to create 24 pieces and place them on a baking sheet lined with parchment paper. Freeze for at least 1 hour to prevent melting during frying.
In a shallow bowl, place the gluten-free flour.
In a second shallow bowl, whisk together the eggs and water until well combined.
In a third shallow bowl, combine the gluten-free breadcrumbs, garlic powder, onion powder, dried Italian seasoning, salt, and black pepper.
Remove the frozen mozzarella sticks from the freezer. Dredge each stick first in the gluten-free flour, shaking off any excess.
Next, dip the floured stick into the egg mixture, coating completely.
Then, roll the stick in the seasoned gluten-free breadcrumb mixture, pressing gently to adhere the coating well.
For an extra crispy coating, repeat the egg dip and breadcrumb coating one more time on each stick.
Place the coated mozzarella sticks back on the parchment-lined baking sheet and freeze for at least 30 minutes before frying.
Heat vegetable oil in a deep skillet or pot to 350°F (175°C). Use enough oil to fully submerge the mozzarella sticks.
Fry the mozzarella sticks in batches for about 1 to 2 minutes or until golden brown and crispy. Do not overcrowd the pan.
Using a slotted spoon, remove the mozzarella sticks and place them on a paper towel-lined plate to drain excess oil.
Serve immediately with marinara sauce or your favorite dipping sauce.