Physician-founded · Independent · Evidence-first
You drink it every day.
Do you know it?
h2know is the independent authority on drinking water — what’s in the bottle, what’s in your tap, and what your body actually needs. No fads. No filter-company scripts. Just evidence.
The mineral spectrum
Not all water is the same water.
Total dissolved solids span nearly two orders of magnitude across the bottled aisle. Tap a dot.
This is a curated slice for readability. Across the full database, TDS runs from 0 mg/L (distilled) to 6,250 mg/L.
Every bottle, decoded
Mineral profiles, TDS, pH, packaging, and price per liter for the waters on your shelf — sortable, comparable, and independent.
Browse the waters →LookupWhat's in your tap?
Enter your zip and we translate your utility's water quality report into plain English — and flag anything close to a limit.
Check your water →RecipesWater is an ingredient
Gram-scale mineral recipes for brewing coffee and rebuilding reverse-osmosis or distilled water — the formulation lab your kitchen was missing.
Open the lab →We check. We don’t guess.
The water aisle is full of claims. Most don’t survive contact with evidence.
Alkaline water balances your body's pH
Your stomach acid and kidneys already do that — precisely.
“Raw” untreated water is more natural
So are giardia and cholera. Treatment exists for a reason.
Hair & nail mineral kits reveal deficiencies
Commercial HTMA testing is unreliable. Validated lab biomarkers are a different thing entirely.
Why trust us
Founded by a physician. Run like a lab.
h2know was founded by a board-certified physician who got tired of watching water marketing outrun water science. Our reviews are independent of what we sell, every product lot we ship will carry its own certificate of analysis, and when the evidence is thin — on skin, nails, and minerals, for instance — we say so.
We don’t claim it. We study it — with your consent, in the open.
Minerals, right-sized. Not maxed-out.
Most electrolyte packets give a desk worker an athlete’s sodium. Ours are tiered to your estimated sweat loss — Daily, Active, Endurance — plus blends that remineralize RO water or build SCA-spec brewing water.
The Waterline — our weekly briefing
Advisories, EPA rulings, new studies, and one myth retired per issue.