How much water? Could it be condensation?
Even in the winter down here I can squeeze out a gallon or so of condensation in a week out of the cabin. If you only visit the boat every couple of weeks the amount of condensation could seem like a lot. And hasen't it been a warm, damp winter up your way? Just a possibility... a couple of suggestions 1) visit her when it rains or take a hose to the cockpit to see if your getting more water in the blige at that point. Although a leak's source can be a pain to hunt down, you'll know its a leak vs condensation.2) Damp-Rid has hanging bags which you can buy in hardware and food stores. They're meant for closet use and are completely self contained. I would suggest throwing two of them in the cabin for a couple of weeks and see what happens. I learned this trick from a friend in our cruising club and it works well.Good Luck.