Hey philso, my kitchen can be pretty toasty during the day, but sometimes in the evening and at night it can get pretty chilly. I suspect that was the issue as we had quite a cold snap that week and I didn't do anything to insulate the container. I do suspect the tap water was a factor as well. I'd been using distilled (I have a distiller) and it was working fine. I forgot on the last feeding and used tap and kaput. Oh well, next round will be the one that works. I'm not going to start it til the weather warms up and all is calm in my brain. LOL.