What if water goes down my throat during wudu while fasting?

It depends on how it happened. If you rinsed normally and a little water slipped down by accident, many scholars say your fast is still valid, because it was not intentional. Some scholars advise making up the day to be safe. If you swallowed on purpose, the fast is broken. Either way, there is no sin for an honest mistake.
Wudu is still part of fasting
You should make wudu as usual while fasting. The Prophet ﷺ told Laqit ibn Sabirah to "perform Wudu well, and go between the fingers, and perform Istinshaq extensively except when fasting" (Jami at-Tirmidhi 788). Istinshaq is sniffing water into the nose. So the Prophet ﷺ did not cancel wudu or rinsing in Ramadan. He only asked fasting people to be gentler, so water doesn't go too far.
Accident or choice?
The key question is your intention. The Quran says:
Applying this, scholars generally say:
- Deliberate swallowing: breaks the fast. You make up the day.
- Over-rinsing or gargling hard: if you rinse far more than needed and water goes down, many scholars say the fast is broken, because you were careless.
- A normal, gentle rinse and an accidental slip: many scholars say the fast remains valid, since you did not mean to swallow and did not exaggerate.
- A cautious view: some scholars say that when water reaches the throat, even by accident, you should make up that day. If you follow this approach, you can simply fast one extra day later.
These are differences of scholarly judgment, so if this happens to you, you can follow your local imam or teacher. It is also helpful to know that forgetful eating is treated gently: "If somebody eats or drinks forgetfully then he should complete his fast" (Sahih al-Bukhari 1933). See What if I eat by mistake while fasting?
What to do if it happens
- Spit out any water left in your mouth.
- Stay calm. Don't panic and don't eat or drink the rest of the day just because you slipped.
- Keep fasting until sunset. If you decide to make the day up to be safe, do it after Ramadan.
- If it keeps happening, ask your imam, who can guide you on your situation.
How to prevent it
- Take a small amount of water in your cupped hand.
- Lean your head slightly forward, not back.
- Swish gently and spit it out. Don't gargle, and don't rinse more than the usual three times.
- Sniff lightly and blow out gently.
- Brush your teeth before wudu, not during it. See Can I brush my teeth while fasting?
If you're still learning the steps of wudu, see How do I make wudu?
- Make wudu as usual while fasting, but rinse and sniff gently.
- Accidental swallowing during a normal rinse doesn't invalidate the fast for many scholars.
- Some scholars advise making up the day as a precaution, which is simple to do.
- Deliberate swallowing or over-rinsing breaks the fast.
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