@DeeKc83 Hi there. I can’t speak directly to your particular brand, but in general, most of these ultrasonic humidifiers say you can use cold tap water. But then they go on to say that using distilled water will cut down on the need to descale them. If you notice a white film building up, use some white vinegar and a soft brush to clean it.
I tried a quick web search to find the user manual for the one sold here, but had no luck. Perhaps check the packaging to see if maybe it got misplaced in unpacking.