Just because I didn't give the answer you wanted does not mean I did not answer the question.
"Where did Jesus instruct to pray to dead people?"
The Saints are not dead. They are living in Heaven.
"Peter himself called Pauls writings *Scripture*. Is Peter wrong?"
Paul's writings are indeed Scripture because they give witness to the Gospel of Jesus, but they are not by themselves the Gospel.
"Where are His instructions about holy water?"
Beginning with Jewish Law and continuing through the actions of Christ Himself and on into the earliest of Christian times water was symbolically used for purification and expiation. I don't have time to look up all of the Scriptural examples but I'm sure you will. Here are but a few: John 13:5 " Then He poured water into the basin, and began to wash the disciples' feet and to wipe them with the towel with which He was girded."
Lev. 8:6 "Then Moses had Aaron and his sons come near and washed them with water."
Ex. 30:18-19 "You shall also make a laver of bronze, with its base of bronze, for washing; and you shall put it between the tent of meeting and the altar, and you shall put water in it. "Aaron and his sons shall wash their hands and their feet from it"
Num 8:7 "Thus you shall do to them, for their cleansing: sprinkle purifying water on them, and let them use a razor over their whole body and wash their clothes, and they will be clean."
And people in hell are living in hell.
They aren’t dead either.
If they died to us, they are beyond our legitimate reach. Contacting someone whose body has died here oh earth is expressly forbidden by God.
Where did Jesus teach us to pray to ANYONE besides God?
Isn’t God good enough? Or maybe He’s too busy? Do you think you can get something out of a saint that God isn’t going to give us?