If your priority is health and wellness, your best drinking water will have at least the first three of the following qualities and optimally, all six:
The water is filtered of unhealthy toxins, including synthetic chemicals, toxic metals, bacteria and viruses, radioactive substances, and other treatment additives such as chlorine and fluoride
The natural occurring minerals in the source water are not removed through purification processes, such as reverse osmosis and distillation.
The drinking water has an alkaline pH between 7.0 and 9.5, which means that the water contains a healthy level of alkaline minerals such as calcium and magnesium.
Water that is electrolyzed or "reduced" will have smaller groupings of water molecules. Drinking reduced water can improve cellular hydration and cell-water turnover (i.e., nutrients into the cells and toxins out)
Water that is ionized has a negative oxidation reduction potential (-ORP) and thus acts to neutralize free radicals in the body and slows the oxidation (i.e., aging) process in the body.
If it doesn't taste good, you'll simply won't drink enough water to stay hydrated enough to optimize the health benefits