Syntax: DRINK <object>
Syntax: EAT   <object>
Syntax: FILL  <object>
Syntax: POUR  <object> out
Syntax: POUR  <object> <object>
Syntax: POUR  <object> <character>

When you are thirsty, DRINK something.

When you are hungry, EAT something.

FILL fills a DRINK container with water.

POUR transfers a liquid to a container, or empties one.
You can also POUR from an object into something a character is holding.