Teriyaki Chicken in the Crockpot

I got a Teriyaki chicken recipe from my sister years ago. Today I decided I didn't want to deal with it so I adjusted it a bit and tossed it all into the crockpot. It was a bit salty so I adjusted the recipe to help correct it.

Ingredients:
3/4 c soy sauce
1/3 c cider vinegar
3/4 c water 
3/4 c sugar
4 T cornstarch
1 t minced garlic
1 t minced ginger (I use Gourmet Garden in the tube if I have it. If not then the powdered ginger works fine)
1/4 t pepper
3-5 chicken breast halves
rice

Place chicken in crockpot. In a bowl combine soy sauce, cider vinegar and water. Mix the sugar and cornstarch to combine. Add to soy mixture and stir. Add garlic, ginger and pepper. Pour over chicken and cook on low 4-5 hours. Shred chicken and serve over rice.