Bring a large pot of salted water to a boil. Add the rotini and cook according to the package directions until al dente, around 8-10 minutes. Drain and set aside.

In the same pot, add ground beef over medium heat. Cook and crumble for about 6-8 minutes until browned. Drain excess fat.

Sprinkle taco seasoning over the meat and pour in water. Mix to combine and simmer for 3-5 minutes until the sauce thickens.

Reduce heat to low and stir in cooked rotini and salsa. Fold everything together for 2-3 minutes.

Sprinkle shredded cheese over the mixture and stir until melted. Remove from heat, add remaining cheese on top, cover, and let sit for 2 minutes.