I second Beth's advice - counterintuitive as it sounds, increasing your water consumption (not in the form of fizzy, isotonic, or caffeinated drinks, though very dilute squash would be fine if you struggle to drink plain water) can help with fluid retention. Laying off salty or sugary snacks and eating lots of potassium-rich fruit and veg can also help. Funny how everything comes back to the same old advice.
Water tablets, either herbal or conventional, make things worse because they deplete the water inside your cells so you retain more to compensate and end up dehydrated but still swollen.
Hope the move goes smoothly!
Cheers, V-rap.