Two ingredients.
Five to seven days.
No yeast packet. No special equipment.
Just flour, water, and your kitchen.
That's all it takes to make a sourdough starter from scratch.
What Is a Sourdough Starter — In Plain English
Think of it like this.
When you leave idli batter out overnight, it ferments on its own — no yeast added. The wild yeast from the air and the flour does all the work.
A sourdough starter works exactly the same way.
You mix flour and water. Leave it out. Wild yeast from the air and the flour moves in, eats the flour, and starts multiplying. You feed it a little flour and water every day. Within a week, it's alive, bubbling, and ready to leaven bread.
Same logic as idli batter. Same logic as kanji. Same logic as curd.
You've been fermenting your whole life. This is just bread.
What You Need
- Any flour — whole wheat atta works brilliantly and actually ferments faster in Indian conditions
- Water — tap water is usually fine
- A clean jar — any glass container works
- A spoon
- 5–7 days
Nothing else.
How to Make It — Day by Day
Day 1
Take your jar. Add:
- 2 tablespoons flour
- 2 tablespoons water
Mix well. Should look like thick idli batter — no dry flour lumps.
Cover loosely with a cloth or a plate. Don't seal airtight — it needs to breathe.
Leave it on your kitchen counter. Not the fridge. Not near the AC. Just room temperature.
Day 2
You may see tiny bubbles. You may see nothing at all. Both are completely normal.
Now do this:
- Throw away half the mixture
- Add 2 tablespoons flour + 2 tablespoons water
- Mix. Cover. Leave.
Why throw away half? Because if you just keep adding flour without discarding, you'll end up with a huge bucket of starter in a week. Discarding keeps the quantity manageable and the yeast active.
Day 3
Bubbles. A faintly sour smell. Maybe the mixture has risen slightly since yesterday.
This means it's working.
Repeat exactly: discard half → add 2 tbsp flour + 2 tbsp water → mix → cover → leave.
Indian kitchen tip: If your kitchen is warm and humid — like most Indian homes in summer — your starter may already be quite active by Day 3. Heat speeds up fermentation. A Mumbai kitchen in May works faster than a London kitchen in December.
Day 4 & 5
More bubbles. A stronger sour smell — somewhere between curd and beer. The mixture visibly rises after feeding and falls back down a few hours later.
That rise and fall is exactly what you want. It means yeast is eating, producing gas, and your starter is becoming more powerful.
Keep repeating once a day: discard half → feed → cover → leave.
Day 6 — The Float Test
Drop a small spoonful of your starter into a glass of water.
Floats → ready to bake. Sinks → feed once more, test again tomorrow.
When it floats, it means there's enough gas trapped inside to lift it — which means there's enough power to lift your bread dough too.
Day 7 — You're Ready
Use it within a few hours of it hitting its peak rise — that's when the yeast is most active and powerful.
Congratulations. You just made a living thing from flour and water.
Important Tips for Indian Kitchens
🌡️ Heat is your friend Indian monsoon make starters come alive faster. Don't follow Western timelines blindly — watch your starter, not the calendar.
🌾 Start with chakki atta Whole wheat atta has more wild yeast naturally present. It ferments faster and more reliably.
❄️ Keep it away from the AC Cold kills fermentation speed. A warm corner — near the stove or on top of the fridge — works best.
Common Problems — Simple Fixes
Smells like nail polish / acetone? It's just hungry. Feed it immediately. That sharp smell means it's run out of food.
Liquid on top? Normal. That's called hooch — it means the starter is hungry. Stir it back in or pour it off, then feed as usual.
Pink or orange streaks? This is the only time to be worried. Discard everything and start fresh. Pink or orange means unwanted bacteria have moved in.
Not rising much after 5 days? Try a warmer spot. Switch to atta. Give it 2 more days. Be patient — every kitchen is different.
One Cool Thing About Your Starter
Your Mumbai starter will taste different from a Delhi starter. Which will taste different from a Bangalore starter.
Researchers found over 70 different types of yeast in sourdough starters worldwide — and these vary based on geographic location and climate. Frontiers
Your local air, your local flour, your kitchen temperature — all of it shapes the flavor of your bread.
Your sourdough will literally taste like where you live.
There's More Than One Way to Make a Starter
The method above — just flour and water — is the most basic approach.
But experienced bakers have developed other tricks to get a starter going faster, more reliably, and with better flavor from the very beginning.
Each method creates a slightly different starter, with a different flavor profile and fermentation speed.
In our beginner sourdough course, we cover 3 different ways to make a starter from scratch — so you can pick the one that suits your kitchen, your schedule, and what you have available.
👉 Join the course to learn all 3 methods
Once Your Starter Is Ready — How to Keep It Alive
- Baking every few days? Keep it on the counter. Feed once a day.
- Baking occasionally? Store in the fridge. Take out 24 hours before baking, feed once, let it activate, then use.
- Going on holiday? Feed it well, seal loosely, refrigerate. It'll survive 2–3 weeks without attention.
The Bottom Line
A sourdough starter is not fragile. It's not complicated. It's not a science experiment.
It's just fermentation — the same thing happening in your curd every morning.
Mix flour and water. Feed it daily. Give it a week.
Then bake.
Want to learn all 3 ways to make a starter — plus the full process from starter to finished loaf, designed for Indian kitchens and basic OTGs?
👉 Join our beginner sourdough course
Taught using everyday tools, basic OTGs, and ingredients from your nearest kirana store.