Zevahim 20: Sanctifying the Kohen's Hands and Feet

Halakhot brought from the land of Israel to the scholars of Babylonia - Rav Dimi quoting R. Yochanan, on the dilemma raised by Ilfa: If water is left overnight, will that work to sanctify hands and feet? Which themselves can stay sanctified overnight. Also, the question of whether leaving the Temple courtyard would require re-washing and sanctifying the kohen's hands and feet. Can the hands and feet be sanctified outside of the Temple? What about if one needs the bathroom?