His diet was restricted to 'liquids'. = He was on a 'liquid diet'.
They offered us snacks and 'liquid refreshments'. [='drinks']
the 'liquid' grace of the dancer's movements
(..) And if you ask me, the only good person is a... Styrofoam! Tag and roll! Tag and what? What? What is this red liquid coming from my paw? It's called blood, hero! - Do I need it? - Yes. So if you want it to keep inside (..)2008 Bolt