I used to struggle with serious edema. I'm talking ten pound fluctuations in a single day, which was definitely a major issue, since I would start the day at ~130 pounds. My thighs would swell up 1-2 inches each to the point where I was sure they would rupture. I have always been neurotic about tracking my intake, and at that point in my life, was probably consuming ~1000 mg +/- sodium per day. I was one of those people who was convinced that if i even glanced at a salt shaker, I'd gain twenty pounds. (Fact: during my ED, I didn't really have any "fear foods" except salt. It carried over into my "recovery" as well, my edema was that bad.)
Anyway -- that was just my background. I still track, to the point where if I grab the Lawry's or something, I actually weigh the shaker before and after use to get an idea of how much salt I'm using. However, with my newfound love of meat (my edema occurred during my almost-vegan period) came a love for smoked, cured meats like bacon and salmon and smoked turkey. (Omnomnom.) I also like a salty, char-grilled steak. Yum. I have had days of upward 3,000+ mg sodium, and a "low" day for me is now around 1800. I am actively trying to reduce my salt, mostly just because I'm convinced I can shed those last 2-3 vanity pounds if I ditch it, but I'm starting to wonder if maybe I'm not as salt-sensitive as I thought.
When I was veggie, I didn't eat gluten/dairy/soy, but I was eating lots of legumes, peanut butter, tons of rice and other grains, and flax. Flax was nearly the end of me. I don't get along well with phytoestrogens, it would seem. Now, my belly is flat, my thighs are slim (not back to where they were before the edema, but the edema brought emotional eating, and I gained about five pounds over the summer due to the anger at my body) and I go to bed about two pounds over where I woke up, instead of ten.
I don't know what the point of me rambling on was, so I'm sorry for my babbling here. :P I think what I'm getting at is yes, I track my salt and I have struggled with edema, but perhaps yours is something else going on rather than salt that is causing your bloating? I'm not sure; I apologize if I come off as assuming or anything. In my case, I think it was intolerances to the foods in my diet, since keeping my salt low didn't help me any then and now I'm a salt glutton and don't struggle with water anymore.
I also start my morning off with green tea, and I drink water all. day. long. I eat foods high in potassium, and I don't go more than an hour or two without an epic pee, either, so I'm pretty sure that I'm flushing it all out.
Good luck with your edema. I know how much it hurts, and I'm sorry you have to struggle with it. <3