Filtered water
For hydration and water quality
Most of the experts we follow recommend it.
Filtered water can reduce unwanted contaminants and support better hydration, especially when remineralized.
Who is behind it
Voices including a GP with a Master of Public Health, a certified nutrition specialist and a Stanford-educated anesthesiologist.
How strong the research is
Mostly expert experience so far, with published research still catching up.
In their words
“I just recommend people avoid tap water so that they're avoiding fluoride they're avoiding microplastics they're avoiding heavy metals... ideally you're like an aor osmosis filter or potentially a berky filter”
a board-certified cardiologist
Filtering removes toxins and remineralization gives water charge, enhancing absorption and hydration.
Animals are susceptible to fluoride toxicity and fluoride accumulates in bones over time.
a certified nutrition specialistsponsoredFiltered water reduces ingestion of microplastics present in tap or bottled water.
Filtered water reduces exposure to chlorine, fluoride, and hormone disruptors.
Filtered water reduces ingestion of heavy metals and contaminants.
Natural minerals should be added to water filtered by reverse osmosis or distillation because these processes remove minerals.
Purified water is necessary as no water is considered safe anymore.
Filtered water with minerals or spring water provides hydration without the need for fancy electrolyte drinks.
Talk it through
Entrain shows what the experts teach, so you can make better decisions with your own clinician. It does not diagnose or prescribe. If something is worrying you, start there.
How this reading was made
Every line here comes from a doctor, scientist or coach speaking publicly, and links to the moment they said it. Entrain listens for where independent experts arrive at the same place on their own, and shows where they part ways. Mostly expert experience so far, with published research still catching up.
Some statements come from sponsored segments or people speaking about their own products. They are marked where they appear and count for less. Last refreshed 23 September 2026.
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