In heist-comedy movie Logan Lucky (2017), nurse said to Joe Bang, who was admitted to infirmary from prison because of nausea:
Nurse: A lot of you guys coming in here like that. It's that business with the water. Say you can't drink it but it's okay to shower in it. I don't know about all that. Hmm. More barf than we saw after that one Thanksgiving when everything had gone bad. It'll put a girl off of turkey forever.
What does "It" in "It'll put" refer to? Does it refer to water used for Turkey or is it refer to the Thanksgiving that caused all the barf?