This research aims to understand the attitudes and perceptions of first-year university students living in residence towards single-use plastic water bottles. The objective is to understand the attitudes and subsequent intentions leading to the students’ behaviours and advocate for sustainable practices on campus. Employing a qualitative approach, we conducted 20 interviews to collect data from first-year McMaster University students living in residence. Following the interviews, we transcribed and analyzed the data to determine codes, which revealed two main themes: "Pros of Single-Use Bottles" and "Determinants Shaping Student Choices”. These themes showcase that participants perceived single-use water bottles as convenient and are concerned about water quality at refilling stations. Participants also shared their thoughts on the accessibility of alternatives to single-use bottles and external factors influencing their behaviour. This study offers nuanced insights into student behaviour and provides a foundation for shaping effective campus policies that align with sustainability goals.