evidence: To use everyday examples, vinegar is very acidic, with a pH of about 2. Conversely, bleach is highly alkaline, with a pH of about 13.5. [...] Drinking water and other water-based drinks of varying pH levels may play a role in a few different health factors. [...] The pH of water for drinking or for use in the home is very important. Water that is too alkaline or too acidic can damage pipes and appliances, and it is generally unhealthful to drink.