How many Miss Waters has Canada had?
CREATE TABLE "references" (
  "rank" real,
  "country_territory" text,
  "miss_earth" text,
  "miss_air" real,
  "miss_water" real,
  "miss_fire" real,
  "semifinalists" real,
  "total" real
);
SELECT MAX("miss_water") FROM "references" WHERE "country_territory"='Canada';