1) Put the chicken in a saucepan along with the water and salt. Bring just to a boil then reduce to a gentle simmer. Cook, covered, until the chicken is just firm, about 15 mins. Set chicken aside off the heat, to cool and finish cooking in the liquid. When cool, pull apart by hand into shredded bite-size pieces.
2) Whisk yoghurt, mayonnaise, lime juice, curry, grated ginger and parsley in a bowl. Add chicken, almonds, and pineapple, and fold to coat evenly. Make open faced sandwiches with the salad and watercress on the bread or muffins. Serve.