A dream vacation in Mexico for two Oklahoma college students morphed into a nightmare after they were violently sickened, reportedly from drinking tainted water at the tourist resort’s bar with fear growing it was laced with potentially deadly poison.

A group that included Kaylie Pitze and Zara Hull arrived in Cancun last Thursday for what was to be the vacation of a lifetime. Everything seemed to be going smoothly until Friday when they had a drink at the resort’s pool bar.

“The last thing they remember is they had asked for a glass of water,” Hull’s boyfriend’s mother, Stephanie Snider, told the outlet. “Their heads went down. They slumped over on the bar.”

They were then wheeled back up to their rooms.

“We were out, couldn’t walk, couldn’t talk, couldn’t do anything,” Pitze told News 9.

Pitze remembered it “hurt” to open her eyes and that she felt extremely nauseous with the next feeling being unable to move.

Hull, meanwhile, began to experience stomach convulsions and had to be hospitalized in Mexico.

“I started having convulsions in my stomach, so they called 911,” Hull told News 9. 

The hospital went as far to require a $10,000 deposit before they would treat her. Hull was forced to pay the money, but her seizures continued.

Jake Snider, her boyfriend, paid $200 per night to sleep in a hospital room.

“The hospital was NOT treating her; they were pumping her full of so many drugs to keep her sedated,” Snider claimed in a Facebook post on Monday.

“They intubated her and told Jake it was ‘sedation’ for the MRI. There was no reason to sedate her, let alone intubate her. We knew we needed to get her out and back to the US.”

“We contacted the US Embassy and were told they couldn’t do anything to help as long as she was in the hospital, so they gave us contacts of people to help with transporting her out of the hospital and Medical Flight people to contact,” Snider wrote.

The US Embassy urged the Hull family and friends to get her back home for treatment.

Hull’s family also had to pay a $26,000 deposit before she could be flown back to the US.

While they are now both back in the US and stable, doctors have been unable to pinpoint what made them so seriously ill.

“We don’t have a lot of answers, we don’t know a lot, we don’t know what she was given in their hospital down there, we don’t know what she was given at the resort,” Hull’s mother told the outlet.

Doctors in the US suspect Hull’s and Pitze’s water may have been spiked with synthetic fentanyl, according to News 9.

“This could happen to anyone,” Pitze told the outlet.