What do you do about the abundance of feminine discharge that necessitates istinja', and the difficulty of finding clean or available restrooms while traveling by car inside and outside the country, especially since your father will not stop for the restroom again?

Female discharges are pure if they originate from the uterus and impure if they exit from the urinary opening. If they are impure, one must perform istinja (definition)' (cleansing) for prayer. It is sufficient for istinja' to remove the impurity and purify its place with water or by using stones or similar materials for istijmar. If istinja' is not possible and you cannot find a place, and you fear the prayer time will expire, then pray according to your condition, and you are not required to repeat the prayer.