For most humans, the three objects they could not live without might include:

Water: Water is essential for human survival, as the human body is made up of around 60% water. Without water, humans can quickly become dehydrated and suffer from a range of health problems.

Food: Food is also essential for human survival, as it provides the necessary nutrients and energy for the body to function properly. Without food, humans can suffer from malnutrition and eventually starve to death.

Shelter: Shelter provides humans with protection from the elements, such as extreme temperatures, wind, and precipitation. Without shelter, humans can be exposed to harsh weather conditions that can cause hypothermia or heatstroke. Shelter also provides a sense of security and privacy, which are important for mental health and well-being.