For God's, drinking distilled water is not necessary. Your blood and intercellular fluids contain minerals and have an osmotic pressure of around 300. Distilled water has an osmotic pressure of around 0. Drinking too much distilled water can cause severe electrolyte imbalances and be potentially fatal. Personally I wouldn't drink it at all.
It's a commonly believed old wives' tale that distilled/deionized water is bad for you. Rain is distilled water FFS.
Unless you have given up eating for an extended period of time there will be more than enough minerals in your body to mineralize the water with zero ill effects. A half gallon of normal tap water will only have about 100 mg of various minerals, which means that's how much distilled water would "rob" from your body even if the old wives' tale were true. If you're worried about it you could eat about 6 Doritos and you'd be all set.
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