Here is a timeline of the last time Stefaniak's was heard from:
Tuesday, Nov. 27:
Burton returned to the U.S. on Tuesday, but Stefaniak planned to stay an extra day to celebrate her birthday.
11:30 a.m.: Stefaniak dropped Burton off at the Juan Santamaría International Airport in San Jose and then returned their rental car to the Thrifty Car Rental.
12:23 p.m.: She took an Uber to a hostel located near the airport. Her Uber driver offered to take her on a tour of the city, and she agreed.
1:04 p.m.: Stefaniak arrived to the Villa Buena Vista in San Jose and took about 30 to 50 minutes to change at the hostel while the driver waited. She paid the driver cash to take her around, and she sent photos to family of her out and about town, where she bought a purse and earrings.
Around 4 or 5 p.m.: The driver dropped her off back at the villa.
6:30 p.m.: Stefaniak sent Burton photo of where she was staying, telling her she planned to go to a jazz cafe.
6:55 p.m.: She sent a message to a WhatsApp group chat with friends, stating that it was raining heavily and that the power had gone out, describing the situation as "Super Sketchy."
7:30 p.m.: Stefaniak Facetimed with a friend until about 9 p.m., telling him that she was considering going to a jazz club but that she was too tired.
8:20 p.m.: Still talking on the phone, Stefaniak texted a group chat on WhatsApp, "I want to go out but I'm dead tired." .
9 p.m.: Her phone then died, ending the FaceTime call. That was the last time anyone had contact with her.
Wednesday, Nov. 28
12:17 a.m.: T-Mobile records show that Stefaniak's phone connected to the internet for a short time around 12:17 a.m.
5:10 a.m.: The guards at the hostel told the family that she checked out with her belongings just after 5 a.m., but her flight wasn't scheduled to take off until 1:30 p.m., her family said, adding that it was unlikely she would check out early for no reason. There were no security cameras on the property or street to verify the hostel guards' claim.
8:30 a.m.: The Uber driver who drove Stefaniak the day before told the family that she had asked him to pick her up the next morning at 8:30 a.m. to take her to a shopping center, but she never showed up.
1:30 p.m.: Stefaniak's flight back to the U.S. was scheduled to leave at 1:30 p.m. She checked into her flight on her phone but never made it. It is unclear what time she checked in for her flight.
Carla Stefaniak: Timeline leading up to disappearance of Florida woman in Costa Rica
No mention here of asking for a water bottle.