I find that I get puffy feet at times as well, and I have little doubt that it is about 'everything in life' related. And it is not that I look down and see the Stay Puffed Marshmallow Man attached to my ankles, I can FEEL they are swollen. I put my feet up, it helps, increase my water intake, it helps, but it never really seems to go away. What I have found out through experimentation, and maybe the folks here can add some info to it, is laxatives if you are on narcotics of any sort or steroids. They seem to do strange things to water retention and where it gets stored.
You are not alone by any means, and I hope that I can shed a little light on an irritating issue.