其实当表你想给别人吃的时候,就多半用Do you want...
eg:Do you want some water?(你想喝点水吗?)
而用Do you like 的时候不一定是表要给你吃的意思,有询问你的爱好的意思.
eg:Do you like drinks?(你喜欢喝饮料吗?)
Do you like...也可以用在别人要招待你什么东西,而问你想吃点什么.
eg:-You seem like very thirsty.Do you want some water?(给你喝)
-Yes.
-uh,do you like orange juice,I bought it this morning.(想喝橘汁吗)
-Oh,it's great!