Bio,
Kudos to you on your dedication to continuing your own "PT" despite the obstacles. I'm sure you have those exercises down well enough to go it alone. I agree that keeping up your exercise is imperative. Hold on to those gains. Every time I have an appointment with my PM I have to fill out the pain form and I consistently write "exercise and elevation" in the blank about what helps. It makes a huge difference for me too and I can definitely tell when I don't do it.
Hopefully the cooler water will not bother you too much. I don't know if keeping your core warm would help your foot or not, but you could prevent overall chill with a "shortie" wetsuit. I got one inexpensively at a sports store and with the shorter leg length it is easy to get on and off.
Just a thought. You might feel silly but I swim with full size pink dive fins so hey, whatever works!