Clean your fridge with disinfectant to prevent dampness and bacteria from growing. Keep a lemon and baking soda in the fridge to prevent foul smell.
Before storing spinach, mint leaves, coriander, etc. wash them and wrap them in paper to keep them fresh for longer period.
Invest in good air-tight containers to store cooked and un-cooked food. Storing food in good containers prevents them from going bad and keeps them fresh.
Before storing fresh fruits and vegetables in the fridge wash them and let them air-dry. This will prevent them from getting spoiled due to the moisture.
If you want to store cooked food during monsoons but are afraid that it will go bad, here is a great option. Freeze the food prepared in air-tight containers. This will help you store cooked food for longer.