Just pour a small amount of water onto the dried mochi and wait for a few seconds, and you'll have soft, chewy mochi. 
All you need is water to eat it As long as you have water, you can eat freshly pounded mochi anytime, anywhere. The instant mochi proposed by the Chlorella Science Institute in Kobe, which developed the fluffy mochi, can be used in a variety of ways, such as for emergency food and stockpiling in preparation for disasters, as well as for "unexpected guests," "midnight snacks for exam-takers," "portable food for outdoor activities," and "companies on overseas trips." Please feel free to keep it on hand at home as well.

Product specifications for Chlorella Science Institute's Soy Sauce Mochi: Just pour in the water and it's ready in no time