Detailed Instructions: Given a premise, an initial context, an original ending, and a new ending, the task is to generate the counterfactual context that is aligned with the new ending. Each instance consists of a five-sentence story. The premise is the first sentence of a story, and the second sentence, which is the initial context, provides more information about the story's context. The original ending is the last three sentences of the story. Also, you are given a new ending that can provide the new story with the same premise. You should write a counterfactual context to explain the small differences between the original and new endings. More specifically, a story context contains the general plot of the story. And a counterfactual context is a slight modification to the initial context. To sum up, you should write the second sentence of a story based on the premise(first sentence) and the new ending(last three sentences) of the story.
Problem:Premise: Tom normally drank Bud Light. 
 Initial Context: A friend bought some high gravity IPAs. 
 Original Ending: Tom tried one but thought it tasted gross. He kept drinking not realizing they had so much alcohol. Tom was drunk within the hour. 
 New ending: Tom tried one but thought it tasted gross. He kept drinking not realizing he wouldn't get drunk. Tom was acting drunk within the hour because of the placebo effect. 
Solution:
A friend bought some bottled water.