There are two different types of cleanliness for water. The first is chemically clean meaning physical impurities are removed and the second is energetically clean meaning the "bad vibes" of everything it has come in contact with is erased or "reformatted."

For chemically clean water, at bare minimum, a simple Britta type pitcher filter is recommended or a PUR type filter that fits on the faucet. They are relatively inexpensive and do a good basic job. This mostly takes out large particulates and almost all the chlorine. Unfortunately, hardly any filters remove fluoride unless you distill the water and add minerals back to it afterwards.

If you use a distiller, make sure to NEVER drink distilled water as distilled water is a solvent. To electrically balance itself out, it will leach minerals out of your body and IT WILL HURT YOU long term. The only time distilled water should be drank is if there is some "salt" buildup in the body and you need to reduce that. Only do that under the supervision of a qualified health practitioner. When you make distilled water, make sure to add minerals back to it so that it is in a healthy form to drink. Distilled water doesn't exist in nature in a drinkable form unless you can suck it out of the air. Ionic minerals are liquid purified desalinated sea water and are the most absorbable form of minerals. There is nothing more absorbable than one ion at a time of any given mineral in my opinion.

Here is a good one: Concentrace Trace Mineral Drops by Trace Mineral Research

I have personally used this one for years. 20-40 drops per day is all that is needed and this one 8oz bottle will last most people about 3 months. Directions are given of how much to add to water to remineralize it. This has about 72+ minerals and trace minerals in the same ratio as the sea. You can add this to distilled water to have clean mineral water. You can probably find other suitable ionic minerals to add to water.

These are some of the highest quality water filtration systems on the market: Equinox Products - Water Filtration Systems
I sold these years ago and at that time almost 10 years ago, NSF (National Sanitation Foundation) only gave their seal of approval on maybe 5-7 systems and our company had about 4 of those. The countertop (EQ-10) model that screws onto the faucet is one of the best you'll find and the Rhino EQ-300 is a whole home system. Put it on your mainline and it will filter sediment out and will purify the water on EVERY tap in the house including your garden hose. There is nothing like bathing and showering in purified water. It look like they have a fluoride and arsenic specialty filter that wasn't available before.

Many systems do NOT filter out toxic bacteria like cryptosporedium but many do. Some system incorporate ultra violet (UV) light that will kill it on contact. It looks like this company has an inline UV light available.

The EQ-40 is one of the best shower filters you'll find.

If you take baths and don't have the main line filtered, you can at least remove most of the chlorine from the bath by using a bath ball.
Amazon.com: Rainshow'r Crystal Bath Ball Dechlorinator - bath water filter great for bathing: Health & Personal Care
These can be hung on the faucet and the water pours through it and the chlorine is neutralized. Also, take the ball and swirl it around in the bath water for a minute or so and it will neutralize even more.

Water filtration has come a long way since then and some are available from Nikken that cleans and "energizes" the water. Some like Jupiter are actually "anti-oxidant" water filters meaning it purifies and negatively charges the water meaning you are drinking a large surplus of electrons that will neutralize free radicals in the body.

Johann Grander is an Austrian genius who has found a novel way to re-energize water and erase any bad information that it contains. On the Track of Water's Secret is a great book that details this profound individual's work:
Amazon.com: On the Track of Water's Secret: Books: Hans Kronberger,Siegbert Lattacher

Masaru Emoto's work involves with water's ability to receive information and store it:
Amazon.com: The Hidden Messages in Water: DVD: Masaru Emoto
His homepage is: https://www.hado.net/