You may use distilled water with your portable ice maker but please take note of the following:
Your portable ice maker has a water sensor that is designed to detect water present in the internal reservoir. This sensor utilizes an electric current to detect the presence of water. This electronic sensor may not detect purified, filtered, reverse osmosis, or distilled water due to the low level of mineral content in these types of water. You may need to add a pinch of salt to the water to increase the mineral content which will allow the sensor to work properly.
For additional information, please refer to the help article What type of water should I add to my portable ice maker?