The question ...

The question seems questionable !

One side you say that its a Mineral Water and say the TDS is 30ppm ! Which Mineral Water for Drinking in the World has TDS 30ppm. Please purchase any Mineral Water Bottle and Check the TDS Levels on it which is clearly printed on almost every company's mineral water bottle. 

But what I feel if you are influenced with the theory which is prevailing now to have drinking water on Alkaline Side which could have some health benefit, then there is another case. So you can increase pH by adding as per prescribed by many fellows here but there could be a compromise between taste and may be odor by adding some chemicals. 

Permissible ​range of TDS in ​drinking water: ​  Different ​government ​has ​different ​regulations for ​the TDS level. ​The U.S. EPA ​sets the ​maximum ​contaminant ​level for TDS ​500 ppm where ​as WHO has ​different ​prescribe ​limits. ​

An aesthetic ​objective of ​≤500 mg/​L has been ​established for ​total dissolved ​solids (TDS) in ​drinking water ​by WHO. At ​higher levels, ​excessive ​hardness, ​unpalatability, ​mineral ​deposition and ​corrosion may ​occur. At low ​levels, however,​ TDS ​contributes ​to the ​palatability of ​water. ​Most people ​think of TDS as ​being an ​aesthetic ​factor. In a ​study by the ​World Health ​ ​Organization, a ​panel of ​tasters came to ​the following ​conclusions ​about the ​preferable ​level of ​TDS in water: ​  ​