[Objects help] drink eat fill

Syntax: drink 

When you are thirsty, drink something. When you are hungry, eat
something.  As in all things edible, you may want to think about whether
the food or drink is good for you or if it might make you sick.

When a container is empty, it can be filled with water from a water
source, such as a spring or fountain.  It can also be filled with 
liquid from a different container.  Certain types of lights, such as lamps,
can also be filled with fuel from a container.

The regeneration of hitpoints depends on how hungry and thirsty you may
be, as well as your constitution.

If you wish to drink from a river or stream in the wilderness, simply
use drink with no object.

See also: quaff poison