Dairy Free Chicken Salad

chopped, cooked chicken1 1/2 cups halved grapes1 cup chopped celery (2 stalks)1/4 cup diced red onion1/4 cup finely chopped chives1/2 cup sliced almonds3/4 cup mayonnaise1/4 cup water1 teaspoon dried mustard powderSalt & pepper, to taste