n by available capacity.

Report pouring it into:
    say "[if the noun is empty][The noun] is now empty;[otherwise][The noun] now contains [current volume of the noun in rough terms] of [liquid of the noun]; [end if]";
    say "[the second noun] contains [current volume of the second noun in rough terms] of [liquid of the second noun][if the second noun is full], and is now full[end if]."

Understand the liquid property as describing a fluid container. Understand "of" as a fluid container.

A liquid source