Hi Megan, I have same problem with swollen ankles, I always drink filtered water as someone already suggested, I'm not sure it helps as my feet and ankles still swell up quite badly. ( have been drinking filtered water, cook with it too for 5 years now) although drinking plenty of water is always good for you.
I have found though that wearing socks seems to keep the swelling at bay. I noticed my feet would swell badly during the night. One very cold night, couldn't get my feet warm I left my socks on. following morning my feet were smaller than they have been for a long time. now I keep my socks on.( obviously clean ones everyday lol) no swelling for a couple of months now. Have tried occassional night without socks and next morning feet and ankles are badly swollen.
My gp put it down to my weight, now he puts it down to diabetes.
Hope this helps some
vonbon