Write the next sentence in the following story.

How to supercool water
Gather the necessary materials.
For this method, you will need salt, purified water, a small clean glass or plastic cup, a large bowl, and ice. If you have a thermometer it would also be useful, but not necessary.

Options are: (I) Make sure your glass is very clean; any impurities can cause the water to crystallize into ice before supercooling occurs. The bowl must be large enough to contain the glass and enough ice to submerge the glass.. (II) Boiling water will convert the salt into a carbonated water to add a nutty sensation as it reaches the proper temperature. You can also wet your ice bowl with lukewarm water to keep your salt water from evaporating and contaminating it, but that is not recommended.. (III) Dissolve some of the salt in water. Add a teaspoon of salt and put a splash of water on your thermometer.. (IV) Pour warm (not hot) water over the salt and you should begin to die away. Splash cold water on your face and neck and pat it dry with a cloth... The answer should be
(I)