Q: If something is forced into the mouth of someone, or his head is forcibly submerged in water, does it invalidate the fast? If they are forced to break their fast, e.g. they are told you break your fast or you/your property will be harmed and they eat something in order to evade the danger, is their fast valid?
A: Forcing food into another’s mouth without their consent does not invalidate their fast and neither does submerging their head in water. However, if they break the fast themselves when forced or threatened, the fasting becomes void.