Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Moldy!

How disappointing! Over the course of about a year and a half, I would use this whenever I would go out of town for the weekend, which was probably 6 times. I would wash and dry it after each use, but upon returning from my last trip I discovered the water dispenser was moldy! Poor kitty! How gross. I'm going for a stainless steel container next time.