I have a Xikar herf I use every day. It takes very little water and very rarely needs any added. You may still be full and don't need any. With it closed all the time it stays pretty moist. What you can do is leave your case open for a day and see if it dries out and accepts more fluid. The one I have is not changeable, so I would suggest using a water pillow, or small boveda pack inside. If all else fails throw it out and buy another, they only run about $15.