I fought this same issue for quite some time. You say water in "trunk". Do you have a 2 door or 4 door? If you have a 4 door put someone in the trunk and get out the water hose. I found no leaks around the trunk but when I put the hose on the sunroof the hose that drains the sunroof and power antennae (they Y together near the bottom of the power ant.). The drain hose below this Y that goes out behind the tire was blocked. A quick blow on the hose cleaned it out and problem solved. If you have a 2 door it may be configured differently.