Is one allowed to wash negel vaser from a bottle or directly from tap or must it be done using a cup? Thank you
It is better to use a vessel (keli) for netilas yadayim in the morning. A bottle is fine.
If a vessel is not available, one can wash one’s hands directly from the tap.
See: Beis Yosef and Shulchan Aruch, Orach Chaim 4:7; Kitzur Shulchan Aruch 2:6.