Do you say "aneinu" if you don't eat anything all day but drink lots of water?
closed as off-topic by DanF, sabbahillel, DonielF, LN6595, Ploni Mar 7 '18 at 22:03
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One who ate or drank during the fast: if it was less than "Kezayit" (an olive’s bulk) of food, or "Kimlo Logmav" (a cheekful) of liquid that was consumed, "Aneinu" may be recited, for, technically, this is not seen as a break in the fast. If more than this amount was eaten, because the fast was broken, one may not recite "Aneinu."