Place all ingredients EXCEPT for the taco shells and toppings in your crockpot. Stir, making sure there's some sauce underneath the chicken so it doesn't end up sticking to the bottom.
Cook on LOW for 8 hours or on HIGH for 4 hours. Shred with a fork, then serve with taco shells and your favorite taco toppings.
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Notes
Salsa: 1 16-oz jar will add plenty of sauce to your chicken. You can use half of the jar if you like. We enjoy a mild, chunky salsa (like Newman's Own Medium) for this recipe, but you can go wild here: Jarred pineapple salsa is delicious, and so is black bean and corn salsa.
Taco Shells: We prefer these with soft taco shells because of the sauce, so hard taco shells make it more difficult to eat - but they definitely work, too.
Nutrition: As always an estimate and here WITHOUT taco shells or toppings, as this will be very individual.