Place the chicken in the slow cooker.
Add the water, salt, pepper, and garlic powder.
Cover the slow cooker and cook on high for 3-4 hours, or until the chicken is cooked through.
Shred the chicken with two forks and add to a bowl.
Mix the chicken with bbq sauce.
To assemble the lettuce wraps, place a spoonful of shredded chicken in each lettuce leaf.
Top with your desired toppings.
Fold up the lettuce leaf and enjoy!