Ekadasi is a perpetual vratam that occurs repeatedly, and gains importance solely based on this. It can always be observed by everyone and even during a period of impurity. Women should observe this fast even during the menstrual time.
Men should observe this fast without drinking water; if one could not do it, they can take water; if that is not possible, fruits and milk are allowed. One who cannot fast by just taking these two are allowed take light tiffin but always avoid eating cooked rice.
It is not a practice for Sumangalis to observe Ekadasi fast without taking even water as she must take care of her husband and do work for the next day for dwadasi paranai. It is sufficient if they co-operate on this front.