What did the soldiers use to give Jesus vinegar while he was on the cross?

Psalm 69:21 - They also gave me gall for my food, And for my thirst they gave me vinegar to drink.

The Psalms aren't often thought of as "prophetic writings," but the New Testament reveals double meanings in many of them that refer to Jesus and the events surrounding His earthly manifestation. Jesus Himself alludes to this in Luke 24:44-

Then He said to them, "These are the Words which I spoke to you while I was still with you, that all things must be fulfilled which were written in the Law of Moses and the Prophetsand the Psalms concerning Me."

One example of this aspect of the Psalms that stands out is found in John 2, after Jesus drove the moneychangers out of the Temple:

John 2:17 - Then His disciples remembered that it was written, "Zeal for Your house has eaten Me up."

Where was this written? Psalm 69:9 - Because zeal for Your house has eaten me up, And the reproaches of those who reproach You have fallen on me.

[Quotes from NKJV]