The only type of living thing that makes its own food are autotrophs.

Autotrophs are organisms that can produce their own food using light, water, carbon dioxide, or other chemicals. There are two basic types:

• Photoautotrophs use sunlight to produce food via photosynthesis (e.g., plants, algae, and cyanobacteria).
• Chemoautotrophs use chemicals to produce food via chemosynthesis (e.g., certain bacteria and archaea in extreme environments).

All other organisms, known as heterotrophs, must obtain their energy and nutrients by consuming other organisms.

Sources:

• Science Learning Hub - Autotrophs and Heterotrophs
• Biology Online - Autotroph