Bear in mind that not all spring waters are the same. Spring water can come from any spring, any where on earth, and can contain anything, lots or almost no minerals. As Discus says, check the bottle for the TDS (Total Disolved Solids).
RO water, (Reverse Osmosis) is almost, but not quite pure and is almost devoid of any minerals.
Distilled water is absolutely pure, with no minerals whatsoever. As Darin says, when using RO or Distilled water, the minerals, macro and micronutrients must be replaced.
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