Place chicken breasts in the slow cooker.
In a bowl, whisk together soy sauce, honey, rice vinegar, water, garlic, and ginger. Pour over chicken.
Cook on low for 4-5 hours or until chicken is tender.
Remove chicken and shred with two forks. Set aside.
In a small bowl, mix cornstarch with 2 tablespoons of water to create a slurry.
Transfer sauce from the slow cooker to a saucepan. Bring to a boil and add the cornstarch slurry, whisking until thickened.
Return shredded chicken to the slow cooker and pour thickened sauce over it. Stir to combine.
Serve over cooked rice with steamed vegetables.