Soft, light, low in dissolved solids. A short guide to what makes rainwater taste the way it does, and how to read a water label.
People who drink rainwater for the first time usually describe it the same way. Light. Clean. Slightly sweet. Nothing sitting on the tongue afterwards.
That is not suggestion, and it is not a trick of the bottle. It is a measurable difference in what the water contains.
Dissolved solids, and why they matter to taste
Every water carries a quantity of dissolved mineral content, usually reported as total dissolved solids. Mineral waters drawn from rock can run high. Rain, having dissolved almost nothing on its way down, starts very low.
Low dissolved solids is what people are describing when they call water light. There is simply less in it. Heavy mineral water has a body and a finish, in the way that wine does. Rainwater has neither, and for a lot of people that is the appeal: it tastes of nothing, which is precisely what water is supposed to taste of.
Neither is objectively better. They are different drinks, and they suit different moments. What matters is knowing which one you are buying.
Hard and soft
Hardness is calcium and magnesium, picked up from rock. Rainwater is naturally soft because it has not been in contact with any.
You can taste the difference, and in some places you can see it: hard water leaves scale, soft water does not. Soft water also behaves differently with tea and coffee, which is why serious coffee people care about water composition at all.
How to read a label
Four things tell you most of what you need to know.
- The source. Mineral water, spring water, purified water and packaged drinking water are different categories with different rules. Purified water can start as municipal supply.
- Total dissolved solids. A number, usually in milligrams per litre. Low means light, high means mineral.
- What treatment was applied. Heavier treatment usually means the source needed more correction.
- Where it was bottled. Not the brand's head office. The place the water actually came from.
The fourth is the one that gets skipped most often, and it is the one that tells you the most. A source is a place. If a bottle will not tell you which place, that is information too.
A premium price is a claim about a source. It is worth checking whether the source is named.
What rainwater is not
It is worth being just as clear about what it does not do.
Rainwater is not a medicine and not a health treatment. Nobody should drink it expecting an effect. It is not richer in minerals than mineral water, it is poorer, by definition and on purpose.
What it is: water that started clean, was caught before it could stop being clean, and was kept that way through to the bottle. That is a narrow claim. It is also the entire claim, and we would rather make one that holds than several that do not.