Were it me, I'd remove some of the liquid into a small pot and set it in the refridgerator and keep an eye on the crock pot, if you see it needs liquid warm the extra then return it to your crock pot..My expierence is that if I add a 1/4 cup of liquid, I'm going to end up with at least a cup or two in the end depending on what I'm cooking..Rather than risk a mess I'd just take some out.
kadesma