I do water-aerobics in public pools several times a week and was concerned that exposure of the affected area to the pool and shower environment might cause re-infection. My wife suggested that I could cover the affected area using a finger cut from a disposable glove. A great idea, but I found that the cover-up would often work its way off the toe, even when covered by a pool shoe.
The image below shows my creative solution.
You may reuse the Great Toe-Fungus Cover-Up several times. Since latex has a tendency to stick to itself, you should drape "A" and "B" over a plastic knife or other suitable material between uses.
Enjoy! And please comment about how this idea works for you.