Add browned ground beef, water, and taco seasoning to a skillet and bring to a simmer over medium-high heat for about 5 minutes.
While the taco meat is cooking, warm your crunchy taco shells on a sheet pan in the oven at 350℉ for about 7 minutes.
Place pitas on a second baking sheet and top with half the shredded cheese. Place in the warm oven just until the cheese is melty (2 - 3 minutes). Watch carefully, as you don't want to toast them. Alternatively, you can do this in the microwave.
Remove the warmed pitas from the oven and place a hard shell taco on each pita, carefully folding it over to allow the melted cheese to stick to both side and "glue" them together.
Fill each shell with your seasoned beef, dressing, the remaining cheese, lettuce, and tomato. Serve immediately.
Notes
Calories are automatically generated. For best results calculate based on your exact ingredients.