Final answer:
The snippets provided do not include a scene where the sniper pours anything into his wound. The answer to the question based on these excerpts cannot be conclusively determined.
Step-by-step explanation:
In the story The Sniper, the protagonist is not described as pouring any substance into his wound directly during the action of the narrative.
The story instead includes scenes where characters are engaged in violent conflicts and make do with the limited supplies they have, such as water. In the excerpts provided, there is no mention of the sniper pouring water, alcohol, antiseptic, or oil into his wound. The closest related action is a character pouring water into another person's mouth to help them, but this is not related to treating a wound.
Therefore, based on the provided excerpts, the correct answer to what the sniper poured into his wound cannot be conclusively determined. However, in typical first aid, any of those substances might be used for different purposes in wound treatment: water to clean, alcohol or antiseptic to disinfect, and oil in other contexts might be used to soothe or prepare the skin for dressing a wound.