Put everything in the crock pot and cook on low for 8 hours (or high for 4 hours). Shred the chicken (in the crock pot) and serve in tortillas with desired toppings.
If you want to prep this ahead of time, take all the ingredients and put them in a ziploc bag. You can store it in the fridge overnight or freeze it for later. If you freeze it, just pull it out and let thaw overnight in the fridge before you put it all in the crock pot.