Why is my drinking water have a bad taste? That is because your water it’s not purified. If you can purify your water to 0-10 hardness on scale (0-500) and contaminant (chemicals, bacterial, mature, etc..) to 0-10 on scale (0-1500), you will find that water taste so crisp. In order to get excellent purified water, you need to install a good filtration system or buy water from local water stores/services because they have strong filtration system. To test your water, you can buy a Digital TDS EC Meter + PH Tester $16.55. Please google because I’m not selling/promoting anything here. I don’t want to be biased against anyone or company.
When you installed an expensive Ionizer machine ($3,000+ USD) into faucet or water line with weak filtration system, Well… Very sorry to tell you that you are drinking modified PH waters with some or all contaminants.
Note: Expensive machine might be a better investment because of its warranty, reliable, and have many functions. Notice I don’t mention/judge brand. That’s your job. You need to research before you buy.
Read more about Drinking Water Contaminants at https://oehha.ca.gov/calenviroscreen/indicator/drinking-water-contaminants.