man needs water to drink,i want something to drink.would you

可以换,意思稍不同
man needs water to drink,人需要喝水,强调喝的是水
i want something to drink.我需要喝点什么.强调是喝的东西
would you like something to eat?你想要吃点什么吗?强调的是吃的东西
man needs to drink water.人需要喝水.强调喝水这个动作
i want to drink something 我需要喝点什么,强调喝这个动作
would you like to eat something.你想要吃什么吗?强调吃这个动作
希望对你有所帮助.