Microwave water and tamarind in medium microwaveable bowl on HIGH 1 min. Mash with fork; let stand 5 min. Strain tamarind through fine-mesh sieve over bowl; firmly press strained tamarind to remove all liquid. Reserve strained liquid in bowl; discard tamarind in sieve. Add coconut milk, dressing, red chili powder and turmeric to reserved liquid; mix well.