Yes, most likely water weight--and it may take a couple of days to move. I've had water take three days to finally go away. It's a good rule of thumb to increase water intake when you're retaining--it moves a little faster that way.

Nasty ice cream, anyway! If it makes you gain water like that, sounds like you need to count all the carbs in it, even the sugar alcohols. Over the past month or so I've stepped back and taken a serious look at products with sugar alcohols, and am eating them even less now than I was before. If I'm desperate I can make something at home instead of depending on what the store carries.

Oops! Editing because I forgot to say, best to you in reaching 199 before your hubby gets back. I sure hope you make it.