Question

اگه آب بخوری روزت (روزه‌ات) باطل میشه

Answer 1

If you drink water, your fast will be /is broken./   becomes / is invalid/   will be /is invalidated. 

Comments

Nice, +1

I think "broken" is better than the others.

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Tnx!

Yes, "broken" is used more commonly that 2 other forms.but in fact:

to break a fast: روزه را گشودن 

Fast is valid/invalid: روزه درست/باطل است 

ولي خب مسلماً باز كردن روزه در غير از زمان افطار، خود بخود  به معناي باطل شدن روزه است! 

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درسته:

Eating and drinking invalidate the fast.

http://www.al-islam.org/a-summary-of-rulings-makarim-shirazi/rules-fasting

Smoking breaks the fast.

http://www.sunniforum.com/forum/showthread.php?1840-ANSWERED-Invalid-Fast