The three items (1) Naka, 2 Soto, and 3 Tumbler (mug) must be thoroughly chilled in the refrigerator. By not adding ice, the drink will not be diluted until the very end, and by keeping all three items chilled, you can enjoy the drink at a delicious temperature until the very end.
Hoppy Beverage Co., Ltd. has the following instructions on how to drink Hoppy:freezing mixture of vinegar and some other flavouring (e.g. soy sauce, sugar, etc.)" and "Three Cold Drinks" are recommended, and the "Hoppy Mug" is designed to fit 90ml inside and 360ml outside.
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