According to AC Nielsen, an international market research firm that two most popular bottled water markets in Taiwan on 2017 are respectively 35.3% of mineral water and 35.1% of functional water.

The Carat media, which has long observed market trends and developments also pointed out that the analysis from 2012 to 2015 in Taiwan bottled water advertising amount (excluded ads at internet ) which more than NT$500,000 brands that found the brand of functional bottled water has grown significantly, The ads amount of functional water has accounted of 29% on 2012 has growing up to 53% on 2015.

More detail Please see the Link ( Chinese Version suggest try translate by Google )---
http://www.foodnext.net/science/scsource/paper/4111187616

From the reports the main market share in Taiwan Bottled water market on 2017 as follows:
Mineral Water is 35.3% Functional Water is 35.1% Pure Water 28.3% on 2017. ( Please refer to chart blow )

2017 Taiwan Bottled Water Consumer Market Shares

Reference: AC Nielsen / FoodnExT Note 1: Functionally claimed bottled water Note 2: Bubble water and other aquatic products

Because the consumers are most concerned their health and seems liked very much on healthful and functional water. Meanwhile some other big beverage companies are entering the market. Obviously, bottled functional waters will be the No.1 sold bottled water in Taiwan shortly.