Bring a large pot of lightly salted water to a boil. Cook spaghetti in the boiling water, stirring occasionally until cooked through but firm to the bite, about 12 minutes.
Drain and transfer to a serving bowl.
Heat olive oil in a skillet over medium heat; cook and stir garlic in the hot oil until lightly browned, 2 to 3 minutes.
Mix water and salad dressing mix into garlic; simmer until liquid has reduced into a sauce, 5 to 7 minutes.
