Remember to change the filter regularly, or else the trapped contaminants build up and flow right back into your glass. Steam-distilled water is often considered the healthiest choice. If you opt to stick with good old tap water, you may want to have it tested by a private lab, not so much for bacteria, but for toxic substances. Remember to let the faucet run for several minutes first thing in the morning and evening. Never use hot water from the tap for cooking.
Hot water leaches out impurities from the pipes.
Always start with cold water when boiling, making coffee, etc. No matter how you get it, though , be sure to drink 6 to 8 glasses of H2O each day to keep your body properly hydrated.