Place potatoes in microwaveable casserole dish. Add water; cover with lid. Microwave on HIGH 8 min., rotating dish after 4 min. Meanwhile, cut thin slice off top of each garlic clove, leaving papery skin on clove; discard tops. (Do not cut root ends.) Place garlic on sheet of foil; drizzle with 1 Tbsp. dressing. Wrap garlic in foil.