im not sure quite how to get rid of the water weight besides just waiting it out.....but I too have been in the same boat as you this summer
while "hot" in Alaska is not the same as hot anywhere else, we've been having weeks upon weeks of temperatures into the 70s and 80s which IS HOT for this rainforest girl
and with the nice weather comes sunburn after sunburn despite sunscreen....and then comes the water retention and desire to exist on ice cream alone lol
ETA: there is no such thing as air conditioning in Alaska....not in any home or place of business