Gx cs4 air compressor

Hi, I have a gx cs-4 air compressor and I was just wondering how often I have to add distilled water as a coolant into it. I have only used it 4-5 times and I put distilled water into it the day I first used it. Thanks for any advice!
Just be sure to use something like water wetter or antifreeze mixed with it. Straight distilled water will cause corrosion over time.