Competition water should be treated like part of the recipe.
Not an afterthought.
When an AeroPress recipe is already carefully controlled, water gives you another variable to tune.
Start with a baseline
Before designing a competition water, establish a baseline.
Use a clean, low-mineral starting water.
Then choose one mineral profile.
Record the composition and TDS.
Brew the same coffee using the same AeroPress recipe.
This gives you something to compare against.
Decide what you want to emphasise
Ask:
What does the coffee already have?
If it is highly floral, perhaps you want to preserve clarity.
If it has strong fruit sweetness, perhaps you want to build roundness around it.
If it feels thin, perhaps a different mineral direction could provide a more satisfying structure.
These are hypotheses.
Taste is what decides.
Profile A: clarity
A clarity-oriented water can begin with relatively restrained mineralisation and controlled alkalinity.
The goal is to avoid excessive buffering or mineral character that could mask delicate flavours.
The exact profile depends on the coffee.
Profile B: sweetness
A sweetness-oriented profile can explore a different calcium-to-magnesium balance and mineral composition.
The objective is not to manufacture sweetness.
It is to see whether the water changes the way existing sweetness is perceived.
Profile C: balance
A balanced profile aims for a middle ground.
You are not maximising acidity.
You are not maximising body.
You are looking for a cup where multiple attributes remain coherent.
Don't copy a champion blindly
A championship water recipe worked in a specific system.
That system includes:
coffee
roast
grinder
water
temperature
brew ratio
agitation
filter
bypass
and the brewer's technique.
Copying one variable doesn't reproduce the entire recipe.
Water is part of the system
This is especially important in AeroPress.
A water profile that works with one coffee may behave differently with another.
A water that works with a 2025 competition coffee isn't automatically the best water for your current coffee.
Use side-by-side tasting
Prepare two waters.
Label them A and B.
Ask another person to randomise them if possible.
Brew the same recipe.
Taste blind.
Look for:
acidity
sweetness
aroma
body
clarity
finish
balance
Then reveal the water.
Build a competition notebook
Record every change.
For each water:
TDS
calcium
magnesium
alkalinity
other relevant ions
brew temperature
dose
ratio
grind
brew time
bypass
sensory notes
This turns competition preparation into a repeatable experiment.
The important thing
Don't search for:
"the champion's water."
Search for:
"my coffee's water."
Championship recipes are useful inspiration.
They are not universal laws.
The Water Artist
A competition water is a hypothesis.
Build it.
Brew it.
Taste it.
Refine it.
Water is the canvas.
You're the artist.