I've had luck managing foot odor by soaking my feet in a mixture of water, salt, and jojoba oil for about an hour. Just salt water might do the trick. Maybe more trips to the beach would be a good way of doing two things at once.
I just sleep on a comforter blanket, on a rug, on the ground. I hang it up every few days to air it out, and fold it up on the other days. It took me a day or two to get used to, and now I've been using it for a few months without any issues.