Remineralizing RO or distilled water

Reverse-osmosis and distilled water are stripped almost bare — near-zero total dissolved solids. That's great for removing contaminants, but it also removes the calcium, magnesium, and bicarbonate that give water body, a rounder taste, and a small nutritional contribution. It's also why very pure water can taste flat or slightly sour.

Adding a pinch of the right minerals back fixes the taste and puts some magnesium and calcium into your glass. Here's how to do it deliberately instead of by guesswork.

What you'll need

Food-grade sources only:

• Magnesium — food-grade magnesium chloride, or Epsom salt (magnesium sulfate) for a firmer, more mineral taste.
• Calcium/alkalinity — baking soda (sodium bicarbonate) for softness and buffer, or calcium chloride / a pinch of gypsum (calcium sulfate) for a crisper profile.
• A gram scale that reads to 0.01 g, or pre-measured mineral drops if you'd rather not weigh.

A simple everyday blend (per 1 liter)

Aim for roughly 100–150 mg/L of added minerals — noticeable but not heavy:

• About 1/16 teaspoon (a small pinch, ~0.15 g) magnesium chloride
• A smaller pinch (~0.10 g) baking soda
• Optional: a tiny pinch of calcium chloride for crispness

Stir until fully dissolved. Taste. Adjust up if it still reads flat, down if it tastes soapy or salty. Your palate is the real instrument here.

Dialing it in

• Tastes flat or watery → add a touch more magnesium; it carries most of the "minerally" flavor.
• Tastes soapy or slightly bitter → you've overdone the bicarbonate or magnesium; dilute with more RO water.
• Want a "spring water" character → lean on magnesium + bicarbonate. That combination mimics limestone-fed springs.
• Want a "crisp/sparkling-ready" base → lean on calcium and sulfate, go lighter on bicarbonate.

A note on why this matters

If you drink RO or distilled water as your main source, remineralizing isn't just about taste. Water is a minor but real contributor of magnesium and calcium for many people, and stripping it to zero removes that contribution entirely. You don't need much — but zero is not the ideal target for water you drink all day.

Make it repeatable

Once you find a blend you like, weigh it out and write it down as a ratio (e.g. "1.5 parts magnesium chloride : 1 part baking soda"). You can pre-mix a small batch of the dry blend and add a consistent scoop per liter — the same principle behind a remineralization packet, just made in your kitchen.

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Use only food-grade minerals. This is general guidance for taste and everyday drinking water, not a treatment for any medical condition. If you're on a sodium-restricted diet, skip the baking soda and use magnesium/calcium chloride instead, and check with your physician.