In a large microwave safe mug place macaroni, salt, and water. Place a larger plate or bowl underneath your mug because it will boil over.
Microwave on high for 5 minutes. Checking the macaroni at 3 minutes for doneness and to stir. Depending on your microwave you may have to cook a minute or 2 longer or shorter.
When you macaroni is cooked there should be 1 -2 tablespoons of liquid in the bottom of you mug, this is good! Stir in your cheese and milk if you desire.