Combine water, vinegar, and salt in large saucepan; bring to boil.
Clean cauliflower; break into florets.
Soak in ice cold water.
Sterilize 12 pint jars.
Put 14 teaspoon garlic powder, 1 garlic clove, 2 peppers, and 1 dill sprig in each jar.
Fill each jar with cauliflower; cover to within 1/2 inch from top of jar with boiling vinegar mixture.
Process in boiling-water bath 15 minutes.
Remove jars; cool slowly.
Immediately use or reprocess jars that do not seal.