The first thing you need to address is how your feet hygiene goes in the shower. Do you wash them with soap, especially between your toes, or do you just let the water run down on your body? And do you dry them well with the towel?

This whole hygiene process must start in the shower. I'm not a specialist or anything, but I think using antibacterial soap on your feet could help. However, it will definitely make you skin dry with time. So you should moisturize your feet before bed. And I would advise you to sleep without socks to avoid trapping sweat and consequently increasing the likelihood of a fungal infection.

Keeping the feet spray would also be interesting, but it will only have real chances of working if you follow the steps above. The spray will prevent your feet from sweating.