Nikkei press reported 2015 energy drink (health water) market share in Japan. According to it, the top supplier was Taisho (58%).
Figure: 2015 Energy Drink Market Share in Japan

Here are samples of energy drinks.
Takeda アリナミンV
Taiho チオビタ
Zeria ヘパリーゼ
| Manufacturer | Market share (%) |
| Taisho | 38.5 |
| Sato | 11.0 |
| Takeda | 8.3 |
| Taiho | 6.7 |
| Zeria | 3.8 |
| Others | 31.7 |
Source is Nikkei Sangyo Shimbun newspaper, the article on 2016 July 25th.
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