Tea, coffee, matcha, and everything else in the glass

Know what is in the cup, and why it tastes that way

KnowSips explains non-alcoholic drinks: what each one is, how it is made, what changes the flavour, and what to do when a cup comes out wrong.

Start with Tea Coffee Matcha Methods All drinks

What else is in the glass

The handful of ingredients that decide most drinks

Almost every drink here is mostly water, plus two or three things that change how it tastes. These are the ones that turn up across every family, and knowing what each actually does is worth more than any single recipe.

01

Water

Between 95 and 99 per cent of what you drink. Its mineral content decides how much flavour is pulled out of coffee or tea, which is why the same beans taste different in two kitchens.

02

Sugar and syrups

Sweetness is only the first job. Sugar also carries body and suppresses bitterness and acid, which is why a drink with it removed tastes thinner and sharper rather than simply less sweet. Simple syrup exists because it will not dissolve cold.

03

Acid

What people mean when they call a drink fresh. It makes you salivate and clears the palate between sips, and it is the difference between a sweet drink that lingers and one that moves on. Citric acid is the same job as a powder.

04

Ice and milk

Both dilute, and both change texture as they do it. Plant drinks behave differently again, because their proteins meet acid and heat in ways dairy does not.

All ingredient guides →

Caffeine, plainly

How much is in what you are drinking

An espresso and a mug of green tea are not in the same league, and neither is a cup of decaf and a rooibos. These are the usual bands for an ordinary serving, so you can see roughly where one drink sits next to another.

Read the full caffeine breakdown →

  • None No caffeine from the drink itself.
  • Low Roughly up to 30 mg in a normal serving.
  • Moderate Roughly 30 mg to 80 mg in a normal serving.
  • High Roughly 80 mg to 150 mg in a normal serving.
  • Very high Above roughly 150 mg in a normal serving.
Four variables

Nearly every drink problem is one of four things

Change one at a time and taste in between. A cup that came out wrong almost always did so because of temperature, ratio, time, or the grind, and the four interact.

01

Temperature

Green tea wants 70 to 80 C and turns harsh above it; rooibos and black tea want it fully boiling. Steeping temperature sets out where each style sits, and why green tea goes bitter is the clearest case of getting it wrong.

02

Ratio

Roughly 60 g of coffee per litre, 2 to 3 g of tea per 200 ml, 2 g of matcha in 70 ml. Strength comes from the ratio; a longer brew is not the same lever. Cold brew is the extreme case at four times the dose.

03

Time

Green tea forgives seconds, rooibos forgives ten minutes, and cold brew is measured in hours. What changes is not strength alone but which compounds arrive, and in what order.

04

Grind and leaf

Surface area decides how fast water can take anything at all, which is why an even grind matters more than an expensive brewer, and why the same leaf in a cramped infuser under-extracts.

How we write these

What to expect from a guide here

KnowSips is written and edited in-house, and sells nothing. There is no shop, no affiliate link, and no sponsored coverage, so nothing here is steering you towards a purchase.

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The mechanism, not the rule
A guide explains what is happening in the cup, so the advice still holds with different kit and different water.
Ranges stay ranges
Where the real figure varies from kitchen to kitchen, you get the range rather than a confident number that would be wrong.
No invented experts
Guides are bylined to the editors. A reviewer is named only where a real one checked the page.
No health advice
Where a guide would need a dietitian or a doctor to say something responsibly, it does not say it.