For fishless cycling you need to make sure that you are adding enough Ammounia to ensure that the bacteria has something to feed on and doesn't die off. I would keep adding 1ppm of Ammonia everyday, especially if the Ammonia is dropping to 0 within a few hours. The only time that you don't need to add more Ammonia is at the very beginning when there isn't enough bacteria present to convert the Ammonia to Nitrite, and the Ammonia level remains steady. Since your Nitrites dropped since yesterday things are looking good to be at the end of your cycle soon.