To store garlic in the fridge take the garlic and mince the garlic up first.
Then take the minced up garlic and put the minced up garlic into an airtight container and then place it in the fridge as normal.
The minced garlic in the fridge should last for up to 3 months as long as the minced garlic remains sealed and refrigerated.
It's best to eat or use the minced garlic before the 3 months as the freshness and quality of the minced garlic can degrade the longer it remains in the fridge.
Whole garlic will spoil pretty fast in the fridge so make sure you mince the garlic first and store it in airtight containers.
Or mince the garlic and freeze the garlic in freezer safe containers or freezer bags and the minced garlic will last for up to a year frozen.