Add all ingredients into your slow cooker, and set on low for 6 hours.
The chicken is ready when it’s no longer pink inside and falls apart easily with a fork. (If you have a meat thermometer, it should read 165°F/74°C.) Lift it out onto a cutting board or into a large bowl, and remove and discard the bay leaves.
Shred the chicken with two forks, pulling it apart in opposite directions.
Scoop out the softened garlic cloves, mash them with a fork, and mix them through the shredded chicken.
Add a few spoonfuls of the cooking liquid to keep the chicken moist, especially if you’re freezing it.
Let it cool, then divide it into freezer bags or containers. Label and date each one.
Store in the fridge for up to 4 days or in the freezer for up to 3 months. Thaw overnight in the fridge before using.