Is it permissible to suffice with ablution (wudu') only for each prayer, without washing the area or changing the undergarments soiled with intermittent vaginal discharge? Is it permissible to pray with the previous ablution when it's not possible to change clothes or perform ablution outside the home, or to delay the prayer until returning home? Is it necessary to verify the dryness of the undergarments before each prayer?

If the discharge is pure and not impure, then purification from it and changing clothes are not obligatory. If you suffer from incontinence of fluids, you must perform ablution after the time for prayer begins, and you may pray as much as you wish with that ablution until the time expires. You are not required to change clothes or perform istinja (purification after excretion). If the discharge is continuous or irregular, your ruling is the same as that of a person with incontinence, and you must perform ablution after the time for prayer begins, according to the majority of scholars. You are permitted to combine two prayers that share a time according to the Hanbalis, and you may adopt the view of the Malikis that ablution is not obligatory for every prayer if the matter becomes difficult.