I can understand the water retention issues but not to the severity you are describing. I would wait until the spring until you have reached a plateau or choose to not lose more weight. I would consider new boots (dependent upon the drastic amount you need to take in the current ones). You don't want to lose the integrity of the boot and compromise the structure or the shape. If you do dramatically retain weight, you may want to consider bringing in the boots to the size when you are bloated and have them along with newer ones to fit your new figure. Just a thought. I know I have to adjust my socks and breeches to help my boots fit when I am bloated, is yours more severe than that?